A particle travels one fourth of the distance constant speed of 5 m/s and remaining distance the constant speed of 18 m/s. What is the average speed of the car?

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11.5 m/s

10.9 m/s

15 m/s

10 m/s

answer is B.

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Detailed Solution

Average speed =xt1+t2=xx4×5+3x4×18 =1120+124=24×2020+24=48044=10.9m/s

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