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Question

A cyclist travels 15 km at 5 km/h and then further 40 km at 20 km/h. What is his average speed of the journey?

A
11 km/hr
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B
12 km/hr
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C
15 km/hr
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D
20 km/hr
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Solution

The correct option is A 11 km/hr

Time taken = DistanceSpeed

Ist leg of the journey: Distance = 15 km, Speed = 5 km/h

Time taken to cover the 1st leg of the journey = 155 = 3 hours

2nd leg of the journey: Distance = 40 km, speed = 20 km/h

Time taken to cover the 2nd leg of the journey = 4020 = 2 hours

Time taken to cover the entire journey = 3 + 2 = 5 hours

Average speed for the whole journey = Total distance travelledTotal time taken

= 15+405 = 555 = 11 km/h


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