Question

A train crosses a man in 5 sec and a bridge of length 300 m in 20 sec. Find the speed and length of the train.

• A. 20 m/s, 100 m
• B. 20 m/s, 150 m
• C. 25 m/s, 100 m
• D. 25 m/s, 150 m

Answer 1

Answer:

A. 20 m/s, 100 m

Let, the speed of the train = x m/s Length of the train = y m 5x = y ⇒ 20x = y + 300 ⇒ 20x = 5x + 300 ⇒ 15x = 300 ⇒ x = 20 ⇒ Speed of the train = 20 m/s Length of the train = (5 × 20) = 100 m