Let the time taken for car 1 to reach P from A be x hours. Speed of car 1=AP/x Given BP=3AP Car 2 starts from B to A and reaches P one hour after car 1 reaches P. Speed of car 2=‌
3AP
x+1
Therefore, ‌
3AP
x+1
=‌
1
2
(‌
AP
x
) Or x=‌
1
5
. Time taken for car 1 to reach P from A is 12 min.