Two cars P and Q start at the same time from A and B which are 120 km apart. If the two cars travel in opposite directions, they meet after one hour and if they travel in same direction (from A towards B), then P meets Q after 6 hours. What is the speed of car P?
Choose the correct choice from the following answers:  A) 87 km/hr  B) 70 km/hr  C) 76 km/hr  D) 97 km/hr  E) 57 km/hr
Let their speed be x km/hr and y km/he respectively.   Then, 120/(x + y) = 1 =&gt; x + y = 120 --- (i)   Now, when they move in same direction:   (Distance traveled by P in 6 hrs) - (Distance traveled by Q in 6 hrs) = 120 km   6x - 6y = 120 =&gt; x - y = 20 --- (ii)   Sloving (i) and (ii), we get x = 70, y = 50   P's speed = 70 km/hr.   Answer: 70 km/hr
<result>B</result>
Two cars P and Q start at the same time from A and B which are 120 km apart. If the two cars travel in opposite directions, they meet after one hour and if they travel in same direction (from A towards B), then P meets Q after 6 hours. What is the speed of car P?