1. The local bus service has 2 lines of buses that start together at 8 am. Buses on line A leave after every 15 minutes while Buses on line B leave after every 20 minutes. In a day, how many times do buses on both line A and B leave together between 8 a.m. and 11 a.m.
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Answer: 2 times
Step-by-step explanation: LCM of 15 and 20 = 60
First time they meet at 9 AM
Second time they meet at 10 AM'
So, they meet 2 times
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