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10/12/2015 Bankers Adda: All About Time And Distance
http://www.bankersadda.com/2015/05/allabouttimeanddistance.html 1/5
THURSDAY, 14 MAY 2015
All About Time And DistanceHello Readers,
Since you all know that Mathematics is one of the most important partof competitive exams, here we posting Some Quick Study Notes on"Time and Distance". We hope that they will help you all in theupcoming competitive exams like SBI PO 2015, Insurance Exams andIBPS CWE 2015. Hope you all like the post..
Introduction:The terms time and distance are related to the speed of a moving object.Speed: Speed is defined as the distance covered by an object in unit time.
Some Important FactsDistance travelled is proportional to the speed of the object if the time is keptconstant.Distance travelled is proportional to the time taken if speed of object is keptconstant.Speed is inversely proportional to the time taken if the distance covered iskept constant.If the ratio of two speeds for same distance is a:b then the ratio of time takento cover the distance is b:a
Relative Speed If two objects are moving in same direction with speeds of x and y then theirrelative speed is (x y)If two objects are moving is opposite direction with speeds of x and y thentheir relative speed is (x + y)
Unit Conversion
Some Important Shortcut Formulas
Rule 1: If some distance is travelled at x km/hr and the same distance istravelled at y km/hr then the average speed during the whole journey is givenby
ExampleJohn goes from his home to school at the speed of 2 km/hr and returnsat the speed of 3 km/hr. What is his average speed during whole journeyin m/sec?Sol:Let’s say x = 2 km/hrAnd y = 3 km/hr, so
Now, average speed in m/sec= 2.4*(5/18) = .67m/sec
Rule 2: If a person travels a certain distance at x km/hr and returns at ykm/hr, if the time taken to the whole journey is T hours then the one waydistance is given by
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10/12/2015 Bankers Adda: All About Time And Distance
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distance is given by
ExampleMr Samson goes to market at the speed of 10 km/hr and returns to hishome at the speed of 15 km/hr. If he takes 3 hours in all, what is thedistance between his home and market?Sol:Let’s say x = 10 km/hry = 10 km/hr, andT = 3 hrs, then
So the distance between home and market is 18 km.
Rule 3: If two persons A and B start their journey at the same time from twopoints P and Q towards each other and after crossing each other they take aand b hours in reaching Q and P respectively, then
ExampleTwo persons Ram and Lakhan start their journey from two differentplaces towards each other’s place. After crossing each other, theycomplete their journey in 1 and 4 hours respectively. Find speed ofLakhan if speed of ram is 20 km/hr.Sol:Let’s say A = Ram and B = Lakhana = 1 and b = 4, then
(20/Lakhan speed) = (2/1)Lakhan’s Speed = 10 km/hr
Rule 4: If the same distance is covered at two different speeds S1 andS2 and the time taken to cover the distance are T1 and T2, then the distanceis given by
ExampleTwo trucks travel the same distance at the speed of 50 kmph and 60kmph. Find the distance when the distance when the time taken by bothtrucks has a difference of 1 hour.Sol:Let’s say S1 = 50 kmph,S2 = 60 kmphT1 – T2 = 1
Distance = [(50*60)/(6050)]*1 = 300km
Quiz On Time And Distance:
1.Busses start from a bus terminal with a speed of 20 km/hr at intervalsof 10 minutes. What is the speed of a man coming from the oppositedirection towards the bus terminal if he meets the buses at intervals of 8minutes?a.3 km/hr b.4 km/hrc.5 km/hr d.7 km/hre.None of these
2.The distance between two cities A and B is 330km. A train starts fromA at 8 (a)m. and travels towards B at 60 km/hr. Another train starts fromB at 9 (a)m. and travels towards A at 75 km/hr. At what time do theymeet?a.10 am. b.10 : 30 am.
c.11 am. d.11 : 30 am.e.None of these
3.Two trains are moving on two parallel tracks but in opposite
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Labels: Daily Quiz, Quant : Quiz, Time. Speed & Distance Concepts
3.Two trains are moving on two parallel tracks but in oppositedirections. A person sitting in the train moving at the speed of 80 km/hrpasses the second train in 18 seconds. If the length of the second trainis 1000 m, its speed is?a.100 km/hr b.120 km/hrc.140 km/hr d.150 km/hre.None of these
4.In covering a distance of 30 km, Abhay takes 2 hours more thanSameer. If Abhay doubles his speed, then he would take 1 hour lessthan Sameer. Abhay's speed is?a.5 kmph b.6 kmphc.6.25 kmphd.7.5 kmphe.None of these
5.It takes eight hours for a 600 km journey, if 120 km is done by trainand the rest by car. It takes 20 minutes more, if 200 km is done by trainand the rest by car. The ratio of the speed of the train to that of the carsis?a. 2 : 3b. 3: 2c. 3 : 4d. 4 : 3e. None of these
Answers with Explanation:
1.(c) Distance covered in 10 minutes at 20 kmph = distance covered in 8 minutesat (20+x) kmph 20× 10/60=8/60(20+x)200 = 160 + 8x8x = 40x=40/8=5 kmph
2.(c) Distance travelled by first train in one hour= 60 x 1 = 60 km Therefore, distance between two train at 9 a.m.= 330 – 60 = 270 kmNow, Relative speed of two trains = 60 + 75 = 135 km/hr Time of meeting of two trains =270/135=2 hrs. Therefore, both the trains will meet at 9 + 2 = 11 A.M.
3.(b) Let the speed of second train be x m/s. 80 km/h = (80×5)/18 m/sAccording to the question 1000/(x+(80×5)/18)=18100 – 18x + 400 x=666/18 m/s= 600/18×18/5 km/h = 120 km/h
4.(a)Let Abhay's speed be x km/hr.Then, 30/x30/2x= 3 6x = 30 x = 5 km/hr.
5.(c)Let the speed of the train be x km/hr and that of the car be y km/hr.Then, 120/x+480/y= 8 1/x+4/y=1/15 ....(i) And, 200/x+400/y=25/3 1/x+2/y=1/24 ....(ii) Solving (i) and (ii), we get: x = 60 and y = 80.Ratio of speeds = 60 : 80 = 3 : 4.
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