Question : A speedboat, whose speed is 20 km/hr in still water, goes 35 km downstream and comes back in a total of 8 hours. What is the speed of the stream?
Option 1: 20 km/hr
Option 2: 10 km/hr
Option 3: 15 km/hr
Option 4: 5 km/hr
Answer (1)
17th Jan, 2024
Correct Answer: 15 km/hr
Solution :
Given,
A speedboat, whose speed is 20 km/h in still water, goes 35 km downstream and comes back in a total of 8 hours.
We know,
Downstream speed = Speed of boat in still water + Speed of stream
and, Upstream speed = Speed of boat in still water - Speed of stream
Let the speed of the stream be
The total time = 8 hours
⇒
⇒
⇒
⇒
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Hence, the correct answer is 15 km/hr.
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