Timework13

0. A train overtakes 2 persons walking at 2 km/hr and 1 km/hr respectively in the same direction and completely passes them in 9 seconds and 10 seconds. Length of the train and its speed in km/hr respectively are

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Option : D
Explanation :
in each case, train has to travel its own length, to pass each man.
If x km/hr is speed of the train, then
Length = Relative speed x Time

∴ 9x - 18 = 10x - 40
⇒ x = 22km/hr.

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