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Question

# A boat, while going downstream in a river covered a distance of 50 miles at an average speed of 60 mph. 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?

A
40 mph
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B
48 mph
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C
50 mph
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D
55 mph
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Solution

## The correct option is B 48 mphTime taken to cover 50 miles downstream =5060=56 hrs Time taken to cover 50 miles upstream =1 hr 15 minutes =54 hrs Total time taken to cover 100 miles =(56+54)=2512 hrs ∴ Average speed =100(2512)=100×1225=48 mph

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