A motor car finishes a journey in 10 hours. The first half is covered at 42 km/h and the second half at 48 km/h. Find the total distance of the journey. MCQ with Answer and Explanation
A motor car finishes a journey in 10 hours. The first half is covered at 42 km/h and the second half at 48 km/h. Find the total distance of the journey.
A. 460 km
B. 420 km
C. 450 km
D. 448 km
Answer: Option D
Solution (By JKSSB Mock Tests)
Let half distance be d. d/42 + d/48 = 10 => (8d + 7d)/336 = 10 => 15d = 3360 => d = 224 km. Total distance = 2d = 448 km.
A person travels a distance of 24 km at a speed of 6 km/h, another 24 km at 8 km/h and a third 24 km at 12 km/h. Find his average speed for the whole journey.
Two locomotive train units 150 meters and 100 meters long are running along parallel track loops in identical directions at speeds of 56 km/h and 46 km/h respectively. In what timeframe will the faster train clear the slower train completely?
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