A man can row a boat at 5 km/h in still water. If the current flows at 3 km/h, h

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Question: A man can row a boat at 5 km/h in still water. If the current flows at 3 km/h, how long will it take him to go 24 km upstream?

Options:

Correct Answer: 6 hours

Solution:

Speed upstream = 5 - 3 = 2 km/h. Time = Distance / Speed = 24 / 2 = 12 hours.

A man can row a boat at 5 km/h in still water. If the current flows at 3 km/h, how long will it take him to go 24 km upstream?

A man can row a boat at 5 km/h in still water. If the current flows at 3 km/h, how long will it take him to go 24 km upstream?

Step 1: Identify the speed of the man rowing the boat in still water, which is 5 km/h.
Step 2: Identify the speed of the current, which is 3 km/h.
Step 3: Calculate the effective speed of the boat when rowing upstream by subtracting the speed of the current from the speed of the boat: 5 km/h - 3 km/h = 2 km/h.
Step 4: Identify the distance the man needs to row upstream, which is 24 km.
Step 5: Use the formula for time, which is Time = Distance / Speed. Plug in the values: Time = 24 km / 2 km/h.
Step 6: Calculate the time: 24 divided by 2 equals 12 hours.

Relative Speed – Understanding how to calculate effective speed when moving against a current.
Time Calculation – Using the formula Time = Distance / Speed to find the time taken for a journey.