CMAT 2018 Solved Question Paper

Question : 11 of 100

Marks: +1, -0

Ankush and Babulal walk around circular track. They start at 9 am. 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 am.?

Validate

Solution:

Ankush does 1 round per 20 minutes.
Babulal does 1 round per 12 minutes.
Then, we have to find in how many minutes it take to complete a round together
⇒

{x/{20} + x/{12}

= 1
⇒

{8x}/{60}

= 1
x = 7.5 min (they meet after every 7.5 min)
from 9 am. to 10:30 am they meet
⇒

{90}/{7.5}

= 12 times

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