Question

Bullet train d which is 323 metre long is moving with an average speed of 121 km/h crosses a bridge in 23 seconds. A farmer walking in the field crosses the same bridge in 4 minutes. Determine the speed of the farmer in m/sec?

Answer 1

Answer:

the speed of the farmer is equal to 467 m/sec

Answer 2

Answer:

The speed of the farmer is 0.187m/s.

Explanation:

Given is a train of length 323m moving with the speed of 121 km/h crosses the bridge in 23 seconds.

Converting the speed of train in m/s,

$121km/h=121*\frac{1000}{60*60}=33.6m/s$

(Length of bridge+length of train)=Speed of train×time taken by train

Length of bridge+323=33.6×23

Length of bridge=450m

Time taken by the farmer to cross the bridge=4 minutes=240seconds

$Speed\ of\ the\ farmer=\frac{Length\ of\ the\ bridge}{Time\ taken\ by\ the\ farmer}$

$Speed\ of\ the\ farmer=\frac{450}{2400} =0.187m/s$

Hence, The speed of the farmer in m/s is 0.187m/s.