A cyclist covers his first 20 km at an average speed of 40 k

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CDS-II 2018 Elementary Math(PYSP)
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MATH

74

M: +1.00/-0.33

A cyclist covers his first 20 km at an average speed of 40 kmph, another 10 km at an average speed of 10 kmph and the last 30 km at an average speed of 40 kmph. Then the average speed of the entire journey is

[CDS-II 2018 Elementary Math(PYSP)]

A 20 kmph

B 26.67 kmph

C 28.24 kmph

D 30 kmph