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A boat, while going downstream in a r...

A boat, while going downstream in a river covered a distance of 50 miles at an average speed of 60 miles per hour. While returning, because of the water resistance, it took 1 hour 15 minutes to cover the same distance. What was the average speed during the whole journey? `40\ m p h` b. `48\ m p h` c. `50\ m p h` d. `55\ m p h`

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