Question

three traffic lights glow at intervals of 4,8 and 10 minutes.if they glow together at 4:20 pm, when will they glow next time together?

Answer 1

to find interval during which they glow together we must find their LCM
LCM of 4,8 and 10=40
so they will glow again in 4:20+40 min
=5:00 pm

Answer 2

Given : Three traffic signals glow at intervals of 4,8 and 10 minutes

they glow together at 4:20 pm

To Find : When will they glow together

Solution:

Three traffic signals glow at intervals of 4,8 and 10 minutes

To find When will they glow together  , need to find LCM

LCM - Least common multiplier

4 = 2 * 2

8 = 2 * 2 * 2

10 = 2 * 5

LCM  = 2 * 2 * 2 * 5  = 40

After 40 mins  Three traffic signals glow  together

4:20 pm  + 40 mins = 5 : 00 PM

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