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A man drives 150 km to the seashore in ...

A man drives 150 km to the seashore in 3 hours 20 min. He returns from the shore to the starting point in 4 hours 10 min. let `r`be the average rate for the entire trip. Then the average rate for the trip going exceeds `r` in kilometres per hour by `2` b. `4` c. `4 1/2` d. `5`

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