Q397
The distance between two places A and B is 140 km. Two cars x and y start simultaneously from A and B respectively. If they move in the same direction, they meet after 7 hours. If they move towards each other, they meet after one hour. What is the speed (in km/h) or car y if its speed is more than that or car x?
A.
100
B.
80
AnswerC.
90
D.
60
Answer: Option B
Solution
Answer: Option B
Solution:
Distance = 140 kmy > x
Same direction:
y - x = = 20 . . . . . .(i)
Opposite direction:
y + x = = 140 . . . . . . (ii)
Add equation (i) and (ii)
2y = 160
y = 80 km/hr