Question : A boat can travel at a speed of 15 km/hr in still water. If the speed of the stream is 5 km/hr, find the time taken by the boat to go 80 km downstream.
Option 1: 3 hr
Option 2: 4 hr
Option 3: 6 hr
Option 4: 5 hr
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Correct Answer: 4 hr
Solution : Given, Speed of boat in still water = 15 km Speed of stream = 5 km/hr Speed of Downstream = Speed of boat + Speed of stream = 15 + 5 = 20 km/hr We know, Time = $\frac{\text{Distance}}{\text{Speed}}$ $\therefore$ Time taken = $\frac{80}{20}$ = 4 hr Hence, the correct answer is 4 hr.
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Question : Find the time taken by a boat to travel 80 km with the current, if the speed of the boat in still water is 14 km/hr and the speed of the current is 6 km/hr.
Option 1: 6 hr
Option 2: 4.5 hr
Option 3: 5 hr
Option 4: 4 hr
Question : The speed of a boat in still water is 17 km/hr and the speed of a stream is 11 km/hr. Find the difference between the upstream speed and the downstream speed of the boat.
Option 1: 18 km/hr
Option 2: 22 km/hr
Option 3: 21 km/hr
Option 4: 28 km/hr
Question : The speed of a boat in still water is 44 km/hr and the speed of a stream is 26 km/hr. Find the upstream speed of the boat.
Option 1: 12 km/hr
Option 2: 18 km/hr
Option 3: 13 km/hr
Option 4: 14 km/hr
Question : A boat can row 24 km in 6 hours in still water It can row 56 km downstream and 30 km upstream in 38 hours. What is the speed of the stream?
Option 1: 3 km/hr
Option 2: 5 km/hr
Option 3: 3.5 km/hr
Option 4: 4 km/hr
Question : Find the speed of a boat in still water if the boat goes 12 km/hr along the stream and 4 km/hr against the stream.
Option 1: 10 km/hr
Option 2: 8 km/hr
Option 3: 7 km/hr
Option 4: 9 km/hr
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