Engineering Board Exam Reviewer · Motion Problems · hard
Melvin rows to a place 48 km distant and back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. Determine the velocity of the stream.
- 0.5 kph
- 1.0 kph
- 3.4 kph
- 7.0 kph
Answer
B. 1.0 kph
Solution
The ratio v downv up = 4/3 leads to R+C=8, R-C=6 after using t1+t2=14 with d=48 km. Solving simultaneously gives R=7 kph, C=1.0 kph.
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