Question

A train first travels for 30 min with a
velocity 30 km/h and then for 40 min
with a velocity of 40 km/h in the same
direction. The average velocity of train is
(A) 35.71 km/hr
(B) 35.0 km/hr
(C) 35.81 km/hr
(D) 35.95 km/hr
​

Answer 1

Answer:A

Explanation:

Distance in first case + distance in second case

15+80/3

=125/3

Average velocity= total distance/ total time

Time = 70 min = 1 and

1/6

So, anwer = (125/3)/(7/6)

= 35.71