Question

A car travels a distance x km with a speed 36km/hr and next xkm with a speed 45km/hr.The average speed of the car is...

Answer 1

Answer:

Explanation:

Total distance =2x

Time for 1st half(t1)=dist/speed=x/36

Time for 2nd half dist.(t2)= x/45

Average speed=total dist./total time

=2x/(x/36 +x/45)

=2x/(9x/180)

=2x/(x/20)

=40km/hr