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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