A boat travels 60 km downstream in 3 hours. If the speed of the boat in still wa

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Question: A boat travels 60 km downstream in 3 hours. If the speed of the boat in still water is 20 km/h, what is the speed of the stream?

Options:

Correct Answer: 10 km/h

Solution:

Speed downstream = Distance / Time = 60 / 3 = 20 km/h. Speed of stream = Speed downstream - Speed of boat = 20 - 20 = 0 km/h.

A boat travels 60 km downstream in 3 hours. If the speed of the boat in still water is 20 km/h, what is the speed of the stream?

A boat travels 60 km downstream in 3 hours. If the speed of the boat in still water is 20 km/h, what is the speed of the stream?

Step 1: Understand that the boat travels downstream, which means it is moving with the current of the stream.
Step 2: Calculate the speed of the boat downstream using the formula: Speed = Distance / Time.
Step 3: Plug in the values: Distance = 60 km and Time = 3 hours. So, Speed downstream = 60 km / 3 hours = 20 km/h.
Step 4: Know that the speed of the boat in still water is given as 20 km/h.
Step 5: Use the relationship: Speed downstream = Speed of boat + Speed of stream.
Step 6: Rearrange the formula to find the speed of the stream: Speed of stream = Speed downstream - Speed of boat.
Step 7: Substitute the values: Speed of stream = 20 km/h - 20 km/h = 0 km/h.

Relative Speed – Understanding how the speed of a boat changes when moving downstream or upstream due to the influence of the stream.
Speed Calculation – Calculating speed using the formula: Speed = Distance / Time.
Stream Speed – Determining the speed of the stream by comparing the speed of the boat in still water and the speed downstream.