Question

a body travels a distance of 10 km with a constant speed of 30 km per hour and then the next 40 km at a constant speed of 50 km per hour find the average speed for the whole journey

Answer 1

Time in 1st case=10/30

=1/3 hrs

Time in 2nd case= 40/50

=4/5 hrs

Avg speed= Total dist./ Total time

=(10+40)/(17+15)

=50/32

=1.56 km/hr

Answer 2

Answer:average speed is 40 km/h

Explanation: