In a 300-meter dash race, X completes the track in 33 seconds and Y completes it in 36 seconds. By what distance does X beat Y? MCQ with Answer and Explanation
In a 300-meter dash race, X completes the track in 33 seconds and Y completes it in 36 seconds. By what distance does X beat Y?
A. 22 meters
B. 25 meters
C. 30 meters
D. 28 meters
Answer: Option B
Solution (By JKSSB Mock Tests)
Speed of Y = 300 / 36 = 25/3 m/s. Distance covered by Y when X crosses the finish line at 33 seconds = (25/3) * 33 = 25 * 11 = 275 meters. Winning margin = 300 - 275 = 25 meters.
A car covers a distance of 200 km at a uniform speed. If the speed is increased by 10 km/h, the journey takes 4 hours. Find the initial speed of the car.
A car travels a distance of 420 km at a certain speed. If the speed is increased by 15 km/h, it takes 5 hours for the journey. Find the original speed.
Explanation:
New speed = 5/7 of usual speed => New time = 7/5 of usual time. Difference = 2/5 of usual time = 24 minutes. 1/5 of usual time = 12 minutes => Usual time = 60 minutes.
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