Maths-
General
Easy
Question
The traffic light at three different road crossing change after every 48sec,72sec and 108 seconds respectively. If they all change simultaneously at 8:.00 hrs, when will they again change simultaneously
- 8 minutes 4sec
- 7 min
- 10 min
- 7 min12sec
The correct answer is: 7 min12sec
To Find the time, when they will change simultaneously we have to find LCM of (48,72,108)
LCM = 2×2×2×3×2×3×3
=432 Seconds
i. e, 7 min 12 sec
∴ Time at which three signals change a gain is 7 min 12sec i.e at 8: 07 : 12.
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