A and B are senior citizens decided to adopt healthy lifestyle practices after retirement to k...........

Quantitative Aptitude ( CCS) Mensuration 2D

A and B are senior citizens; decided to adopt healthy lifestyle practices after retirement, to keep diseases like Obesity and Diabetes at bay. Next morning, A and B started walking around a rectangular park. They started at 7 a.m. from the same point in opposite directions. A and B walked at a speed of 4 rounds per hour and 6 rounds per hour respectively. How many times shall they cross each other after 7 a.m. and before 8 a.m.?

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Explanation:

Relative speed of A & B = (4+6) rounds per hour = 10 rounds per hour
Time taken by A & B to cross each other = 1/10 hours = 60/10 minutes = 6 mins Thus, after every 6 minutes, they will meet each other.
Hence, in 1 hour i.e. 60 mins, they will meet/cross each other 60/6 = 10 times