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Comparing Quantities : Introduction

Farah is on a...

Question

Farah is on a boating trip with her father. The speed of the river they are on is 5 km/h, and their speed along the flow of the river is 10 km/h. What is the speed of their boat?

A

5 km/h

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B

15 km/h

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C

3 km/h

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D

10 km/h

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Solution

The correct option is A 5 km/h
Speed of the river = 5 km/h
Speed of Farah's boat along the flow of the river = 10 km/h

Speed of Farah's boat along the flow of the river
= Speed of Farah's boat + Speed of the current

That is,
10 km/hr = Speed of Farah's boat + 5 km/h

Thus, speed of Farah's boat = (10 – 5) = 5 km/h

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