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A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
  • a)
    2 hours    
  • b)
    3 hours    
  • c)
    4 hours    
  • d)
    5 hours
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A boat can travel with a speed of 13 km/hr in still water. If the spee...
A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
Speed down stream = (13+4) km/hr = 17 km/hr.
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Most Upvoted Answer
A boat can travel with a speed of 13 km/hr in still water. If the spee...
To solve this problem, we need to use the concept of relative velocity. The speed of the boat in still water is given as 13 km/hr, and the speed of the stream is given as 4 km/hr.

The boat is traveling downstream, which means it is moving in the same direction as the stream. When the boat moves downstream, its effective speed is the sum of its speed in still water and the speed of the stream. So, the effective speed of the boat is 13 km/hr + 4 km/hr = 17 km/hr.

We are given that the distance to be covered is 68 km downstream. To find the time taken by the boat to cover this distance, we can use the formula:

Time = Distance / Speed

Plugging in the values, we get:

Time = 68 km / 17 km/hr = 4 hours

Therefore, the correct answer is option C, 4 hours.
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A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.a)2 hours b)3 hours c)4 hours d)5 hoursCorrect answer is option 'C'. Can you explain this answer?
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