Question
Download Solution PDFA boat racer can row 21
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDF
Given:
A boat racer can row 21
The speed of the river is 12.5 km/hr, it takes him 40 minutes to row to a place and back.
Calculations:
Let the distance be x, then,
Upstream speed
⇒ 21
⇒ 22.5 - 12.5
⇒ 10 km/h
Downstream speed
= 22.5 km/h + 12.5 km/h
= 35 km/h
According to the question,
x/10 + x/35 = 40/60
⇒x(1/10 + 1/35) = 2/3
⇒x(45/350) = 2/3
⇒x = 2 × 70 / 3 × 9
⇒x = 5
Hence , The Required value is 5
Last updated on Jul 17, 2025
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