Question

A car travels equal distances in the same direction with speed 60 kmph, 20 kmph and 10 kmph respectively. The magnitude of average speed of the car over the whole journey of motion is
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Answer 1

HELLO DEAR,

let S km be that equal distance.

So with 60 kmph speed time taken will be S/60 h.

With 20 kmph speed time taken will be = S/20 h.

And with 10 kmph speed time taken will be = S/10 h.

So total time of travelling = S (1/60 + 1/20 + 1/10) = S/6 h

Total distance traversed = 3 S

Hence, average speed = 3 S / (S/6) = 18 kmph.

I HOPE IT'S HELP YOU DEAR,

THANKS

Answer 2

Answer:

ur answer is in attachment

hope it helps