Discussion Forum



1)

A train covers a distance of 12 km in 10 minutes. If it takes 6 seconds to pass a telegraph post, then the length of the train is :


A) 90 m

B) 100 m

C) 120 m

D) 140 m

E) 145 m

Answer:

Option C

Explanation:

Speed $=\left(\frac{12}{10}\times 60\right)$ km/hr $=\left(72\times\frac{5}{18}\right)$ m/sec $=20$ m/sec.

Length of the train = (Speed $\times$ Time) $=(20\times 6)$ m = 120 m.