A covers 2 rounds in 1h, while B covers 3 rounds in 1h of a circular track. Since, they are moving the opposite direction, therefore minimum time when they first meet =‌
60
5
=12min ∴ They will meet 5 times in 1h and 2times in next 2h. Therefore, they will meet 7 times between 8 am to 9:30 am.