A boat can go 36 km upstream in 4.5 hours. If the speed of the stream is 3 km/h,

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Question: A boat can go 36 km upstream in 4.5 hours. If the speed of the stream is 3 km/h, what is the speed of the boat in still water?

Options:

Correct Answer: 9 km/h

Solution:

Speed upstream = 36/4.5 = 8 km/h. Speed of the boat in still water = speed upstream + speed of stream = 8 + 3 = 11 km/h.

A boat can go 36 km upstream in 4.5 hours. If the speed of the stream is 3 km/h, what is the speed of the boat in still water?

A boat can go 36 km upstream in 4.5 hours. If the speed of the stream is 3 km/h, what is the speed of the boat in still water?

Step 1: Calculate the speed of the boat going upstream. To do this, divide the distance traveled upstream (36 km) by the time taken (4.5 hours).
Step 2: Use the formula: Speed = Distance / Time. So, Speed upstream = 36 km / 4.5 hours = 8 km/h.
Step 3: Identify the speed of the stream, which is given as 3 km/h.
Step 4: To find the speed of the boat in still water, add the speed of the stream to the speed upstream. So, Speed of the boat in still water = Speed upstream + Speed of stream = 8 km/h + 3 km/h.
Step 5: Calculate the final speed of the boat in still water: 8 + 3 = 11 km/h.

Relative Speed – Understanding how the speed of a boat is affected by the current of the stream when moving upstream and downstream.
Speed Calculation – Calculating speed using distance and time, and applying the formula: speed = distance/time.