Question

A train 150. Long is moving with a speed of 90 km/h in what time shall it cross a bridge 850m long

Answer 1

Explanation:

length of train=150m

speed=90km/h=25m/sec

length of bridge=850m

so time taken =

$\frac{total \: distnce}{speed} = \frac{150m + 850m}{25m |sec} = \frac{1000m}{25m |sec} = 40sec$

=so it will take 40 seconds to cross a bridge