Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. What is the time (in seconds) which they take to cross each other?
Relative speed=s=60+40=100kmph=100*5/18m/sec=250/9m/sec Distance=d=140+160=300m Time=t=d/s t=(300)/(250/9)=10.8sec Ans :Two trains cross each other in 10.8 sec
How many seconds will a 468 m long train take to cross a man driving his motor bike at a speed of 39 km/hr in a direction of the moving train if the speed of the train is 120 km/hr?
Kajal and Rajendra start running from the same place at the rate of 7.6 kmph and 7.85 kmph respectively. What time in hours will they take to be 13.5 km apart, if they run in the same direction?
Two trains, each 100 m long, moving in opposite directions, cross each other in 8 seconds. If one is moving twice as fast the other, then what is the speed of the faster train ?
A car can travels 450 km in 4 hours. If the speed is decreased by 15 1/2 kmph, how much time does the car take to cover a distance of 873 km?
A man can row a boat at 25/9 meters per second in still water and the speed of the stream is 8 kmph. What is the time taken (in hours) to row a distance of 90 km down the stream?
