A car covers 1/3 rd of the total distance with a
speed of 5 ms-1 and the rest of the journey
with a speed of 10 ms -1. Its average speed
is
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3
Answer:
7.5 ms-1
Explanation:
Let the distance be 3x
Distance covered by car at 5 ms-1 = 3x/3 = x
Distance covered by car at 10 ms-1 = 2x
Time = x/5 + 2x/10 = 2x/5
Average speed = (3x)/(2x/5) = (3x/2x)*5 = 15/2 = 7.5 ms-1
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