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. 400 km
B. 500 km
C. 450 km
D. 360 km
Answer: Option D
Solution (By JKSSB Mock Tests)
Let distance be d. d/72 - d/90 = 1 => (5d - 4d)/360 = 1 => d/360 = 1 => d = 360 km.
Two cars start from the same spot and travel along perpendicular roads. One travels at 15 km/h and the other at 20 km/h. Find the distance between them after 2 hours.
Explanation:
In 2 hours, the first car travels 30 km and the second car travels 40 km. Direct distance = sqrt(30^2 + 40^2) = sqrt(900 + 1600) = sqrt(2500) = 50 km.
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