A train travelling at the speed of x km/h crossed a 200 m long platfo…

Question

A train travelling at the speed of x km/h crossed a 200 m long platform in 30 seconds and overtook a man walking in the same direction at the speed of 6 km/h in 20 seconds. What is the value of x?

Accepted Answer

Option B. 60. Answer & Solution Answer: Option B Solution: & Let the length of train = l km & l + 0.2x = 303600 & 120 ( l + 0.2 ) = x & 120 ( l + 24 ) = x . . . . . . . . ( i ) & lx - 6 = 203600 & 180l = x - 6 & 180l + 6 = x . . . . . . . . ( ii ) & From equation ( i )\,\& \, ( ii ) & 120l +…