Find the required time — task. Maths CBSE Live product, Pre-Crash Course.

The traffic lights at three different road crossings change after every 90 seconds, 100 seconds and 120 seconds respectively. If they change simultaneously at 7 a.m., what's their next simultaneous change time?

Ans:

They will change simultaneously again at

$7:15 \ a.m$
$7 : 30 a . m$
$8:07:14 \ a.m $
$8:15:14 \ a.m$

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8. Find the required time

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