If a boat can travel at 20 km/h in still water and the speed of the stream is 5

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Question: If a boat can travel at 20 km/h in still water and the speed of the stream is 5 km/h, how long will it take to travel 60 km downstream?

Options:

Correct Answer: 3 hours

Solution:

Speed downstream = 20 + 5 = 25 km/h. Time = Distance / Speed = 60 / 25 = 2.4 hours.

If a boat can travel at 20 km/h in still water and the speed of the stream is 5 km/h, how long will it take to travel 60 km downstream?

If a boat can travel at 20 km/h in still water and the speed of the stream is 5 km/h, how long will it take to travel 60 km downstream?

Step 1: Identify the speed of the boat in still water, which is 20 km/h.
Step 2: Identify the speed of the stream, which is 5 km/h.
Step 3: Calculate the speed of the boat when going downstream by adding the speed of the boat and the speed of the stream: 20 km/h + 5 km/h = 25 km/h.
Step 4: Identify the distance to be traveled downstream, which is 60 km.
Step 5: Use the formula for time, which is Time = Distance / Speed.
Step 6: Substitute the values into the formula: Time = 60 km / 25 km/h.
Step 7: Calculate the time: 60 divided by 25 equals 2.4 hours.

Relative Speed – Understanding how to calculate the effective speed of a boat when considering the speed of the stream.
Time Calculation – Using the formula Time = Distance / Speed to find the time taken for a journey.