A boat can travel 20 km upstream in 4 hours. If the speed of the current is 2 km

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Question: A boat can travel 20 km upstream in 4 hours. If the speed of the current is 2 km/h, what is the speed of the boat in still water?

Options:

Correct Answer: 8 km/h

Solution:

Speed upstream = 20 / 4 = 5 km/h. Speed in still water = Speed upstream + Speed of current = 5 + 2 = 7 km/h.

A boat can travel 20 km upstream in 4 hours. If the speed of the current is 2 km/h, what is the speed of the boat in still water?

A boat can travel 20 km upstream in 4 hours. If the speed of the current is 2 km/h, what is the speed of the boat in still water?

Step 1: Calculate the speed of the boat going upstream. The boat travels 20 km in 4 hours.
Step 2: Use the formula for speed, which is distance divided by time. So, speed upstream = 20 km / 4 hours.
Step 3: Calculate the speed upstream: 20 / 4 = 5 km/h.
Step 4: Understand that the speed of the boat in still water is the speed upstream plus the speed of the current.
Step 5: The speed of the current is given as 2 km/h.
Step 6: Add the speed upstream (5 km/h) to the speed of the current (2 km/h).
Step 7: Calculate the speed in still water: 5 km/h + 2 km/h = 7 km/h.

Relative Speed – Understanding how the speed of a boat is affected by the current when traveling upstream or downstream.
Speed Calculation – Calculating speed using distance and time, and applying it to find the speed in still water.