Question

a car travels a distance of 100 kilometer it was first 50 km at a speed of 20 km per hour next 70 km per hour at a speed of 30km\h at remaining speed of 25 km\h calculate the average speed of a car

Answer 1

Explanation:

Total time for the journey, t=100/45=20/9 hrs

Time for first 50 km, t

1

=50/30=5/3 hr

So, time for remaining journey, t

2

=20/9−5/3=5/9 hrs

Speed for remaining journey v

2

=

5/9

50

=90 km/h

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