Question : Direction: A boat can travel at a speed of 30 km/hr in still water. If the speed of the stream is 6 km/hr. Find the time taken by the boat to go 108 km downstream.
Option 1: 2 hrs
Option 2: 5 hrs
Option 3: 3 hrs
Option 4: 4 hrs
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Correct Answer: 3 hrs
Solution : Speed of the boat in still water = 30 km/hr
Speed of the stream = 6 km/hr
Downstream speed of the boat = Speed of the boat in still water + Speed of the stream = 30 + 6 = 36 km/hr.
We will use the time-speed-distance relationship which is Time = (Distance ÷ Speed).
Time taken to travel 108 km = 108 ÷ 36 = 3 hrs .
Hence, third option is correct.
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