Q342
A car travels from P to Q at a constant speed. If its speed were increased by 10 km/hr, it would have taken one hour lesser to cover the distance. It would have taken further 45 minutes lesser if the speed was further increased by 10 km/hr. What is the distance between the two cities ?
A.
420 km
AnswerB.
540 km
C.
600 km
D.
650 km
Answer: Option A
Solution
Answer: Option A
Solution:
Let distance = x km and usual rate y kmphThen,
And,
On dividing (i) by (ii) we get :
y = 60
Substituting y = 60 in (i), we get: x = 420 km