Mathematics · LCM and HCF
There are four cell phones in a house. At 5 a.m., all four phones ring together. Thereafter, the first one rings every 20 mins, the second one every 30 mins, the third one every 40 mins, and the fourth one every 50 mins. At what time will the four cell phones ring together again?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 13 A.M.
- 23 P.M.✓
- 31 A.M.
- 41 P.M.
Correct answer
3 P.M.
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