A) 135 km/h
B) 128 km /h
C) 125 km/h
D) 140 km/h
Correct Answer: B
Solution :
Let the distance from Nagpur to Allahabad= k km Now, time taken to travel from Nagpur to Allahabad \[=\frac{x}{150}\,\,h\] Also, time taken to travel from Allahabad to Nagpur\[=\frac{x}{150}\,\,h\] \[\therefore \]Average speed Total distance travelled \[\text{Average speed}=\frac{\text{Total}\,\,\text{distance}\,\,\text{travelled}}{\text{Total time taken}}\] \[=\frac{x+x}{\frac{x}{100}+\frac{x}{150}}=\frac{2x}{\frac{3x+2x}{300}}=\frac{2x\times 300}{5x}=120\,\,km/h\]You need to login to perform this action.
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