Question

a train 400 m long is travelling at a speed of 72 km/h. how long will it take to cross s telephone pole​

Answer 1

Answer:

speed = Distance / Time

Distance = 400 m

speed = 72 km/hr = 72 ×5 ÷18 m/s = 20 m/s

Step-by-step explanation:

S = D / T

20 = 400 /T

T = 400/ 20 =20 sec