Question : If the speed of a boat in still water is 20 km/hr and the speed of the current is 5 km/hr, then the time taken by the boat to travel 100 km with the current is:
Option 1: 2 hours
Option 2: 3 hours
Option 3: 4 hours
Option 4: 7 hours
Correct Answer: 4 hours
Solution :
Given: Distance = 100 km
Speed of boat in still water = 20 km/hr
Speed of current = 5 km/hr
The speed of the boat with the current = Speed of boat in still water + Speed of current
= 20 + 5 = 25 km/hr
Time taken by boat = $\frac{\text{Distance}}{\text{Speed}}$ = $\frac{100}{25}$ = 4 hours
Hence, the correct answer is 4 hours.
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