A river flows at a speed of 4 km/h. If a boat can travel at 10 km/h in still wat

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Question: A river flows at a speed of 4 km/h. If a boat can travel at 10 km/h in still water, how long will it take the boat to travel 12 km upstream?

Options:

1 hour
2 hours
1.5 hours
3 hours

Correct Answer: 2 hours

Solution:

Effective speed upstream = 10 km/h - 4 km/h = 6 km/h. Time = Distance / Speed = 12 km / 6 km/h = 2 hours.

A river flows at a speed of 4 km/h. If a boat can travel at 10 km/h in still wat

Practice Questions

A river flows at a speed of 4 km/h. If a boat can travel at 10 km/h in still water, how long will it take the boat to travel 12 km upstream?

1 hour
2 hours
1.5 hours
3 hours

Questions & Step-by-Step Solutions

A river flows at a speed of 4 km/h. If a boat can travel at 10 km/h in still water, how long will it take the boat to travel 12 km upstream?

Step 1: Identify the speed of the river, which is 4 km/h.
Step 2: Identify the speed of the boat in still water, which is 10 km/h.
Step 3: Calculate the effective speed of the boat when going upstream by subtracting the river's speed from the boat's speed: 10 km/h - 4 km/h = 6 km/h.
Step 4: Identify the distance the boat needs to travel upstream, which is 12 km.
Step 5: Use the formula for time, which is Time = Distance / Speed.
Step 6: Plug in the values: Time = 12 km / 6 km/h.
Step 7: Calculate the time: 12 km / 6 km/h = 2 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.

A river flows at a speed of 4 km/h. If a boat can travel at 10 km/h in still wat

What’s inside this PDF?

A river flows at a speed of 4 km/h. If a boat can travel at 10 km/h in still wat

Practice Questions

Questions & Step-by-Step Solutions

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