a car travels 30 km at a uniform speed of 40 km per hour and 30 km at a uniform speed of 20 km find its average speed
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Answered by
1
Answer:
average speed
Explanation:
i think it is a 10 km speed
sufiajahan79:
no
Answered by
3
Ist case
Speed=40km/hr
Distance=30km
Time=30/40
=3/4
2nd case
Distance=30km
Speed=20km/hr
Time=30/20
=3/2
Avg. speed= Total dist./Time taken
=(30+30)/(9/4)
=60*(4/9)
=80/3
=26.66km/hr
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