Previous Year Questions

As M and N are walking in opposite directions, their relative speed is the sum of their speeds:

Relative Speed = Speed of M + Speed of N

Relative Speed = 5+2=7 rounds per hour

Time interval = 6:30 a.m.- 5:00 a.m. = 1.5 hours

Number of times they cross each other = Relative Speed x Time Duration

Number of times they cross each other =7 X 1.5

Number of times they cross each other = 10.5

Since they cannot cross each other half a time, we consider the whole number.

Number of times they cross each other before 6:30a.m. is 10.

Option (a) is the correct answer.