Question
Car ‘X’ can cross a 720 metre long bridge in 24 seconds. Car ‘X’ is 140 metres ahead of car ‘Y’ which is travelling in the same direction as that of car ‘X’ with a speed of 40 m/s. After how many seconds will car ‘Y’ meet car ‘X’?
Solution
Speed of car ‘X’ = 720 ÷ 24 = 30 m/s So, relative speed of car ‘Y’ with respect to car ‘X’ = 40 – 30 = 10 m/s Distance between the two cars = 140 metres So, time taken by car ‘Y’ to meet car ‘X’ = 140 ÷ 10 = 14 seconds
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