Question

A train travels at a speed of 60km/hr for 0.52 hrs. and at 30km/hr for the next 0.24 hrs. and at 70km/hr. for the next 0.71 hrs. What is the average speed of the train ?

Answer 1

Here , total dist = speed x time
 so , d = (60 x 0.52) + (30 x 0.24)+( 70 x 0.71)
=>d= 88.1 km
here ,total time taken will be 
t= 0.52+0.24+0.71 = 1.47 hrs
wkt , average speed = d/t 
=> 59.932 = 60 km/hr 

hope it helps to you.