Question
A man travels 50 km at speed 25 km/h and next 40 km at 20 km/ h and there after travels 90 km at 15 km/h. His average speed is :
Answer: Option C
Answer: (c)Total distance covered= (50 + 40 + 90) km = 180 kmTime = $\text"Distance"/ \text"Speed"$Total time taken= $(50/25 + 40/20 + 90/15)$ hours= (2 + 2 + 6) hours = 10 hours∴ Average speed= $\text"Total distance"/ \text"Total time taken"$= $180/10$ = 18 kmph
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Answer: (c)Total distance covered= (50 + 40 + 90) km = 180 kmTime = $\text"Distance"/ \text"Speed"$Total time taken= $(50/25 + 40/20 + 90/15)$ hours= (2 + 2 + 6) hours = 10 hours∴ Average speed= $\text"Total distance"/ \text"Total time taken"$= $180/10$ = 18 kmph
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