Question

In a journey of 240 km, if a rider of a bike increases the average speed of the car by
15 kmph, he saves 80 minutes. The increased average speed of the car is​

Answer 1

Answer:

Let distance be x.

Time in going, t 1 = x/50

Time in coming, t 2 = x/40

Total time T = x/40 +x/50 = 9x/200

Average speed = total distance/ total time

=( x+x)/(9x/200)= 2x ×200/9x = 400/9 = 44.44 km/h