Question

Two persons are walking beside a railway track at respective speeds of 2 and 4 km per hour in the same direction. A train came from behind them and crossed them in 90 and 100 seconds, respectively. The time, in seconds, taken by the train to cross an electric post is nearest to​

Answer 1

Two person to be A and B

A = 2km/hr and B = 4 km/hr

Speed of the train = t km/hr

Given, Train crosses A in 90 seconds (Length of the train is the distance)

t – 2 in 90 seconds and t – 4 in 100 seconds

Ratio of speed is opposite to time

(t – 2) 90 = (t - 4) 100

Solving t = 22km/hr

For A, Speed = t – 2 = 20 km/hr in 90 seconds

So travelling at 22 km/hr ----> (90×20)/22 ≅ 82

Answer = 82 seconds

Answer 2

Answer:

hey hey

she is girl not boy