Answers

The Brainliest Answer!
2015-03-24T23:25:18+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Bell1 : tolls at  t = 0seconds, 7s, 14s, 21s....
      2"                  0s, 8s, 16s, 24s,...
     3:  0,11,22, 33s,...
     4:  0, 12, 24,36,48s,...

LCM of 7s , 8s ,11s ,12 is :  7 * 2 *2*2 *11 * 3 = 1848 sec = 30 min and 48 seconds.
so we add 30 m 48 sec to the previous time instant that they tolled together.

next time all the bells will toll together will be at  9 h 30min 48 sec
next time it will be  10 h 1 min 36 sec
next it will be at  10 h 32 min 24 sec
next it will be  at  11 h  3 min 12 sec
next it will be at    11 h  34 min 0 sec
next it will be at  12 h  04 min 48 sec..  this is after 3 hrs from 9 am.

===>  to do it simply:  in 180 minutes = 3 hrs,  they toll together
   =  180 min / 30min 48sec  times
     =  5.84  times  that is  5 times.

3 5 3