Discussion Forum



1)

A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long ?


A) 40 sec

B) 42 sec

C) 45 sec

D) 48 sec

E) 49 sec

Answer:

Option A

Explanation:

Speed $=\left(45\times\frac{5}{18}\right)$ m/sec $=\frac{25}{2}$ m/sec.

Total distance covered $=(360+140)$ m $=500$ m.

$\therefore$ Required time $=\left(500\times\frac{2}{25}\right)$ sec = 40 sec.