P and Q walk around a circular jogging field at a speed of 2 rounds per hour and 3 rounds per hour. They start in the opposite direction from the same point. How many times will they cross each other within 1 and half hours
"Suppose two objects bodies are moving in opposite directions at u m/s and v m/s, then their relative speed is = (u + v) m/s"
Here, the relative speed of P and Q = (2 + 3) = 5 rounds per hour
They cross each other 5 times in an hour and 2 times in half an hour.
Hence, they cross each other 7 times within 1 and half hours.
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