- A6 times
- B7 times
- C2.4 times
- D5 times
Step-by-Step Solution
D : U = 7 : 5 (speeds are inverse to times). Boat : stream = (7 + 5)/2 : (7 − 5)/2 = 6 : 1, so 6 times.
Answer: A) 6 times
A cargo barge needs 7 hours to push up a certain stretch of river and 5 hours to come down it. Its still-water speed is how many times the speed of the current?
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