SOLUTION: A crew of four practices by rowing up a river for a fixed distance and then returning to their starting point. The river has a current of 3km/h.
(A) Currently the crew can row 15k
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-> SOLUTION: A crew of four practices by rowing up a river for a fixed distance and then returning to their starting point. The river has a current of 3km/h.
(A) Currently the crew can row 15k
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Question 1113673: A crew of four practices by rowing up a river for a fixed distance and then returning to their starting point. The river has a current of 3km/h.
(A) Currently the crew can row 15km/h in still water. If it takes them 25 minutes to make the round-trip, how far upstream did they row?
(B) After some additional practice the crew cuts the round-trip time to 23 minutes. What is their still-water speed now? Round answers to one decimal place. Answer by ikleyn(52781) (Show Source):
Time equation is
a) = + (<<<---=== = 25 minutes = 25/60 of an hour)
= ==== Multiply by 36 both sides ====>
2L + 3L = 5*3
5L = 15 ====> L = = 3 km.
Answer. One way distance is 3 miles.
Check. = = = ! Correct !
Solve b) following the same scheme/method.
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It is a typical and standard Upstream and Downstream round trip word problem.
