A man standing on a railway platform noteced that a train took 21 secods to cross the platform (this means the time elpsed from the moment the engine enthers the the platform till the last compartment leaves the platform ) which is 88 meters long and that it took 9 seconds to pass him ,ASsuming that the train was moving with unform speed , what is the langth of the train in meters ?

Options

A. 55
B. 60
C. 66
D. 72

Answer

C

Explanation

let speed of train is v m/s
`so xx21=88+l `
`implies 21v = 88+l`
& also
`implies vxx9=l`

So `21 xx(l)/(9) =88+l`
`implies l=66.`