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Q.

A car travels  X km at 60 kmph and travels another 2 X kms at 40 kmph. The average speed over the either distance is

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a

48 kmph

b

320 kmph

c

56 kmph

d

45 kmph

answer is A.

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Detailed Solution

Speed ( x)=60 kmph, Speed( y)=40 kmph

Average speed =2xyx+ykm/hr

=2×60×4060+40=48kmph

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