A) 13
B) 15
C) 19
D) 21
Correct Answer: C
Solution :
If the distance be \[x\]km, then \[\frac{x}{40}-\frac{x}{50}=\frac{6}{60}\,\,\Rightarrow \frac{x}{4}-\frac{x}{5}=1\] \[\Rightarrow x=20\] km. \[\therefore \]Required time \[=\left( \frac{20}{40} \right)\] hour 11 minutes \[=\left( \frac{1}{2}\times 60-11 \right)\] minutes =19 minutesYou need to login to perform this action.
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