If a boat can travel 60 km upstream in 5 hours, what is the speed of the stream

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Question: If a boat can travel 60 km upstream in 5 hours, what is the speed of the stream if the speed of the boat in still water is 15 km/h?

Options:

Correct Answer: 3 km/h

Solution:

Speed upstream = 60 / 5 = 12 km/h. Speed of stream = Speed of boat - Speed upstream = 15 - 12 = 3 km/h.

If a boat can travel 60 km upstream in 5 hours, what is the speed of the stream if the speed of the boat in still water is 15 km/h?

If a boat can travel 60 km upstream in 5 hours, what is the speed of the stream if the speed of the boat in still water is 15 km/h?

Step 1: Understand that the boat travels upstream against the current of the stream.
Step 2: Calculate the speed of the boat when it is going upstream. This is done by dividing the distance traveled by the time taken. Here, the distance is 60 km and the time is 5 hours.
Step 3: Use the formula: Speed = Distance / Time. So, Speed upstream = 60 km / 5 hours = 12 km/h.
Step 4: Know that the speed of the boat in still water is given as 15 km/h.
Step 5: To find the speed of the stream, subtract the speed upstream from the speed of the boat in still water. So, Speed of stream = Speed of boat - Speed upstream = 15 km/h - 12 km/h.
Step 6: Calculate the speed of the stream: 15 - 12 = 3 km/h.

Relative Speed – Understanding how the speed of a boat is affected by the current of the stream when traveling upstream.
Speed Calculation – Calculating speed using distance and time, and applying the formula to find the effective speed in different conditions.