Two cars A and B travel from one city to another at speeds of 72 km/h and 90 km/h respectively. If car A takes 1 hour more than car B for the journey, what is the distance between the two cities? MCQ with Answer and Explanation
Two cars A and B travel from one city to another at speeds of 72 km/h and 90 km/h respectively. If car A takes 1 hour more than car B for the journey, what is the distance between the two cities?
A. 360 km
B. 500 km
C. 450 km
D. 400 km
Answer: Option A
Solution (By JKSSB Mock Tests)
Let distance be d. d/72 - d/90 = 1 => (5d - 4d)/360 = 1 => d/360 = 1 => d = 360 km.
If a delivery agent cycles at 15 km/h instead of 11 km/h, he travels 20 km more in the same allotted duration. Find the actual distance covered by him at his lower speed.
Explanation:
Let the time duration be t hours. Distance difference = 15t - 11t = 4t = 20 km => t = 5 hours. Distance covered at lower speed = 11 * 5 = 55 km.
Explanation:
New speed = 4/5 of usual speed => New time = 5/4 of usual time. Difference = 1/4 of usual time = 12 minutes. Usual time = 12 * 4 = 48 minutes.
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