Question
Download Solution PDFA boat running upstream takes 10 hours to cover a certain distance, while it takes 7 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and that of the water current, respectively?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
Time taken to cover the upstream distance = 10 hours
Time taken to cover the downstream distance = 7 hours
Concept used:
If distance is constant then,
Speed ∝ (1/time)
Calculation:
Distance is constant, so
Time taken for upstream : time taken for downstream = 10 : 7
Speed for upstream : Speed for downstream = 7 : 10
Now,
Speed of boat : speed of stream = (10 + 7)/2 : (10 - 7)/2
⇒ 17 : 3
∴ The correct option is 4.
Last updated on Jul 23, 2025
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