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A car goes one kilometer at 30 km per h...

A car goes one kilometer at 30 km per hour and then goes another kilometer at 40 km per hour . The average speed (in km / hour) of the car for 2 km is

A

35

B

` 34 (2)/(7)`

C

` 33 (3)/(7)`

D

` 33 (5)/(7)`

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The correct Answer is:
B
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