Question : Two boats go downstream in a river at a speed of 35 km/hr and 25 km/hr. The speed of the stream is 4 km/hr. The distance between both boats initially is 60 km. In how much time will they meet if the boats are going downstream?
Option 1: 10 hours
Option 2: 13 hours
Option 3: 6 hours
Option 4: 8 hours
Correct Answer: 6 hours
Solution :
The relative speed of both the boats = 35 km/hr – 25 km/hr = 10 km/hr
Distance = 60 km
⇒ Time = $\frac{\text{Distance}}{\text{Speed}}=\frac{60}{10}=6$ hours
Hence, the correct answer is 6 hours.
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