Question

A train has a speed of 60 km/h for the first one hour and 40km/h for the next half hour. Its average speed in
km/h is
(a) 50
(b)53.33
(d) 70
(C) 48​

Answer 1

Answer:

average speed = total distance travelled / total time taken

and we know that distance = speed × time

so when speed is 60 the distance will be 60×1=60 km

and when speed is 40 the distance will be 40×1/2=20km

hence average speed is : 60+20/1+1/2

=80/1.5

=800/15

=53.33 km/hr