Two cars A and B leave an intersection simultaneously. A travels North at 45 km/h and B travels East at 60 km/h. Find the direct distance between them after 1 hour. MCQ with Answer and Explanation
Two cars A and B leave an intersection simultaneously. A travels North at 45 km/h and B travels East at 60 km/h. Find the direct distance between them after 1 hour.
A. 85 km
B. 70 km
C. 75 km
D. 80 km
Answer: Option C
Solution (By JKSSB Mock Tests)
In 1 hour, distance covered by A = 45 km, and by B = 60 km. Direct distance = sqrt(45^2 + 60^2) = sqrt(2025 + 3600) = sqrt(5625) = 75 km.
A locomotive express train passes a milestone column track point in 10 seconds flat. If the speed index of the train records at 54 km/h, find the length of the train layout.
Explanation:
Let total distance be 80 km. First part = 20 km; Time = 20 / 20 = 1 hour. Remaining part = 60 km; Time = 60 / 40 = 1.5 hours. Total distance = 80 km, Total time = 2.5 hours. Average speed = 80 / 2.5 = 32 km/h.
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