A) 20 minutes
B) 36 minutes
C) 1 hour
D) 1 hour 20 minutes
Correct Answer: B
Solution :
The average speed taken by the cyclist \[=25\,km\,{{h}^{-1}}=\frac{25}{60}\,km\,{{\min }^{-1}}\] Total distance travelled \[={{P}_{1}}+{{P}_{2}}+{{P}_{3}}=4+5+6=15\,km\] \[\text{Time}\,\text{taken}\,\text{=}\,\,\frac{\text{Distance}}{\text{Speed}}\] \[=\frac{15}{25}\times 60=\frac{90}{25}=36\,\text{minutes}\]You need to login to perform this action.
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