Question

Trains leave Bristol to Cardiff every 15 minutes to London every 21 minutes A train to Cardiff and a train to London both leave Bristol at 11am. At what time will a train to Cardiff and a train to London next leave Bristol at the same time?
I don't know please help
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Answer 1

Step-by-step explanation:

If we take lcm of 21 min and 15 min we get 105 min

therefore, 105 min after 11 a.m. would be 12:45 p.m.

hope this helps you