A boat takes 3 hours to go 36 km upstream. If the speed of the current is 3 km/h

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

Options:

Correct Answer: 12 km/h

Solution:

Speed upstream = Distance/Time = 36 km / 3 hours = 12 km/h. Speed in still water = Speed upstream + Speed of current = 12 km/h + 3 km/h = 15 km/h.

A boat takes 3 hours to go 36 km upstream. If the speed of the current is 3 km/h, what is the speed of the boat in still water?

A boat takes 3 hours to go 36 km upstream. If the speed of the current is 3 km/h, what is the speed of the boat in still water?

Step 1: Identify the distance the boat travels upstream, which is 36 km.
Step 2: Identify the time it takes for the boat to travel upstream, which is 3 hours.
Step 3: Calculate the speed of the boat while going upstream using the formula: Speed = Distance / Time.
Step 4: Plug in the values: Speed upstream = 36 km / 3 hours = 12 km/h.
Step 5: Identify the speed of the current, which is given as 3 km/h.
Step 6: To find the speed of the boat in still water, add the speed upstream to the speed of the current: Speed in still water = Speed upstream + Speed of current.
Step 7: Plug in the values: Speed in still water = 12 km/h + 3 km/h = 15 km/h.

Relative Speed – Understanding how the speed of a boat is affected by the current when moving upstream or downstream.
Distance, Speed, and Time Relationship – Applying the formula Distance = Speed × Time to calculate speed in different conditions.