Question : Let the speed of the boat in still water be 17 km/hr and let the speed of the stream be 5 km/hr. What is the time taken by the boat to go 110 km downstream?
Option 1: 4.5 hours
Option 2: 6 hours
Option 3: 5.5 hours
Option 4: 5 hours
Correct Answer: 5 hours
Solution : The downstream speed of the boat is the sum of the speed of the boat in still water and the speed of the stream. The downstream speed of the boat is 17 km/hr + 5 km/hr = 22 km/hr $\text{Time} = \frac{\text{Distance}}{\text{Speed}}$ So, the time taken by the boat to go 110 km downstream is: $\text{Time} = \frac{110 \text{ km}}{22 \text{ km/hr}} = 5 \text{ hours}$ Hence, the correct answer is 5 hours.
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Question : A boat covers a distance of 72 km downstream in 6 hours, while it takes 12 hours to cover the same distance upstream. What is the speed of the boat in still water?
Question : A boat can go 40 km downstream and 25 km upstream in 7 hours 30 minutes. It can go 48 km downstream and 36 km upstream in 10 hours. What is the speed (in km/hr) of the boat in still water?
Question : A boat running downstream covers a distance of 20 km in 2 hours, while it covers the same distance upstream in 5 hours. Then, the speed of the boat in still water is:
Question : A boat travels 60 kilometres downstream and 20 kilometres upstream in 4 hours. The same boat travels 40 kilometres downstream and 40 kilometres upstream in 6 hours. What is the speed (in km/hr) of the stream?
Question : The speed of a boat in still water is 15 km/hr, and the speed of the current is 5 km/hr. In how much time (in hours) will the boat travel a distance of 60 km upstream and the same distance downstream?
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