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
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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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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.
Question : A boat moves downstream at a rate of 8 km/hr and upstream at 4 km/hr. The speed of the boat in still water is:
Question : A boat goes 20 km upstream and 44 km downstream in 8 hours. In 5 hours, it goes 15 km upstream and 22 km downstream. Determine the speed of the boat in still water.
Question : A boat moves downstream at the rate of 1 km in $7\frac{1}{2}$ minutes and upstream at the rate of 5 km an hour. What is the speed of the boat in the still water?
Question : The speed of the boat down the stream is 125% of the speed in still water. If the boat takes 30 minutes to cover 20 km in still water, then how much time (in hours) will it take to cover 15 km upstream?
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