Question

A train 100m long is to cross a river bridge of length 800m. What time will it take to cross the bridge?Given that the train moves at a constant velocity of 36km/h.

Answer 1

the train will completely cross the bridge so we have to include the length of train also

Total Distance =800+100=900m
Velocity = 36 km/hr
$36 \times \frac{5}{18} \\ 10m { s}^{ - 1}$
$t = \frac{s}{v} \\ t = \frac{900}{10} \\ t = 90sec$

Answer 2

Answer:

25s

Explanation:

Total distance required for the train to cross the bridge is,

d = (100 + 800) m = 900 m

Hence the time taken to cross the bridge is,

t = 900 / 36 = 25 s.