Speed of the motorboat against the stream is 12 km/hr. and speed with the stream is 18 km/hr. Find the speed of motorboat in still water.15 km/hr.16 km/hr.18 km/hr.14 km/hr.
Question
Speed of the motorboat against the stream is 12 km/hr. and speed with the stream is 18 km/hr. Find the speed of motorboat in still water.15 km/hr.16 km/hr.18 km/hr.14 km/hr.
Solution
The speed of the motorboat in still water is calculated by taking the average of the speed of the boat with the stream and against the stream.
Step 1: Add the speed of the motorboat with the stream and against the stream. 12 km/hr (against the stream) + 18 km/hr (with the stream) = 30 km/hr
Step 2: Divide the sum by 2 to find the average speed, which is the speed of the motorboat in still water. 30 km/hr ÷ 2 = 15 km/hr
So, the speed of the motorboat in still water is 15 km/hr.
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