A car travels 100km at a speed of 60 km/h and returns with a speed of 40km/h .calculate the average speed for the whole journey?
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Average speed= distance travelled /total time taken
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Answer:i hope this help you
Step by step Explanation:
Distance travelled when car goes for the journey(D1) =100km
It return from the same route so (D2)also =100km
Time of going for journey (t1)=100/60
=1.67 hr
Time of car return from journey
(t2)=100/40
=2.5hr
Total time =t1+t2
=1.67+2.5
=4.17h
Average speed=100+100/4.17
=200/4.17
=47.96 (approx)
=48km/h
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