Crossing count on a circular track
CMAT 2018 · Quantitative Techniques & Data Interpretation · Medium · Time Speed Distance
Ankush and Babulal walk around circular track. They start at 9 a.m. from the same point in the opposite directions. Ankush and Babulal walk at a speed of 3 rounds per hour and 5 rounds per hour respectively. How many times shall they cross each other until 10.30 a.m.?
- A.
9
- B.
10
- C.
12
- D.
11
Answer
C
Explanation
Since they move in opposite directions, relative speed = rounds per hour. Time duration from 9:00 a.m. to 10:30 a.m. = 1.5 hours. Total crossings = Relative speed Time = times.
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