An electric device makes a beep after 60 seconds and an another one after 62 seconds.They beeped together at 10.00a.m. Again they will beep at

• After 31 mins i.e at 10:31 hrs
• 12 years agoHelpfull: Yes(17) No(8)
• after 30 mins i.e 10:30 becoz at 10:01 first sound will come den at 10:01:02 second one will come. so after 30 mins 2 sec*30 i.e 60 . therefore, ist will sond at 10:30 and also 2nd will sound.(10:01:02... 10:02:04... 10:03:06..... 10:29:58.. 10:30).
• 12 years agoHelpfull: Yes(8) No(3)
• LCM of (60,62)=1860sec
  Now 1860sec=31min
  so after 31min they will beep together so at 10:31am
• 9 years agoHelpfull: Yes(4) No(0)
• LCM of(60,62)=31mints
  at 10.31am both will beep
• 10 years agoHelpfull: Yes(0) No(1)
• after 31 mins i.e 10:30 becoz at 10:01 first sound will come den at 10:01:02 second one will come. so after 30 mins 2 sec*30 i.e 60 . therefore, ist will sond at 10:30 and also 2nd will sound.(10:01:02... 10:02:04... 10:03:06..... 10:29:58.
  ....10:31:00)
• 10 years agoHelpfull: Yes(0) No(0)