A boat running upstream distance of 10 km in 30 min and while running downstream, it covers the same distance in 25 min. What is the speed of the river current (in km/h)?
Correct Answer: Description for Correct answer:
Speed upstream = \( \Large \frac{10}{\frac{30}{60}}=\frac{10 \times 60}{30} \)
= 20 km/h
Speed downstream = \( \Large \frac{10}{\frac{25}{60}}=\frac{10 \times 60}{25} \)
= 24 km/h
Therefore, Speed of the river's current
= \( \Large \frac{1}{2 \left(24-20\right)=\frac{4}{2} } \) = 2 km/h
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