A) 8 km/h
B) 12 km/h
C) 16 km/h
D) 20 km/h
Correct Answer: A
Solution :
Distance travelled by P till they meet \[=60-12=48\,km\] Time taken by P till they meet \[=\frac{48}{x-4}\] Since, time taken by both will be equal. \[\therefore \] \[\frac{72}{x}=\frac{48}{x-4}\] \[\Rightarrow \] \[72x-288=48x\] \[\Rightarrow \] \[24x=288\] \[\Rightarrow \] \[x=12\,\text{km/h}\] Speed of\[P=x-4\] \[=12-4=8\,\text{km/h}\]You need to login to perform this action.
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