A schoolboy covers his walk to school at 4 km/h and arrives 9 minutes late. The next day, he steps up his pace to 6 km/h and arrives 1 minute early. Find the distance. MCQ with Answer and Explanation
A schoolboy covers his walk to school at 4 km/h and arrives 9 minutes late. The next day, he steps up his pace to 6 km/h and arrives 1 minute early. Find the distance.
A. 2.2 km
B. 2.0 km
C. 2.5 km
D. 1.8 km
Answer: Option B
Solution (By JKSSB Mock Tests)
Time difference = 9 - (-1) = 10 minutes = 10/60 = 1/6 hours. Let distance be d. d/4 - d/6 = 1/6 => d/12 = 1/6 => d = 2 km.
A motorboat maps 32 km downstream in 2 hours and tracks the same upriver stretch upstream in 4 hours. Find the baseline speed of the boat hull in still water.
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