A) 14 km
B) 20 km
C) 16 km
D) 18 km
Correct Answer: D
Solution :
Let the distance between P to R is x km. \[\triangleright \triangleright \] For B?s motion \[\triangleright \] For A?s motion Then, \[\frac{x}{3}=\frac{21}{4}+\frac{21-x}{4}\] \[\therefore \] \[7x=2\times 3\times 21\] \[\therefore \] \[x=18\]You need to login to perform this action.
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