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Speed of a boat in still water is 10 km/hr. If speed of stream is 2 km/hr, then how much distance can the boat travel downstream in 2.5 hours?
1. 30 km
2. 24 km
3. 32 km
4. 28 km

1 Answer

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Best answer
Correct Answer - Option 1 : 30 km

Given:

Speed of a boat in still water = 10 km/hr

Speed of stream = 2 km/hr

Concept used:

Downstream speed = Speed of a boat in still water + Speed of stream

Calculation:

Downstream speed = 10 + 2 = 12 km/hr

In 1-hour boat travels = 12 km

Then, in 2.5 hours boat will travel = 2.5 × 12 = 30 km

∴ The boat will travel 30 km downstream.

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