Question

a 1500m long train is going at a speed of 40km per hour .how much time will it take to pass through 2500 m long platform...plz explain...answer is 6 minuts

Answer 1

s = d/t. 

As it is 1500m long, it will have to pass (2500+1500)m, which is 4000m.
40 = 4/x.
x = 4/40
x = 1/10 hours
1/10 hours = 6 minutes.