Four bells are heard at intervals of 2,3,5 and 7 minutes respectively. If all bells toll together exactly at 9
a.M., they will again be heard together at
a. 10.10
a.M.
b. 9.30
a.M.
c. 11.45
a.M.
d. 12.30 p.M
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Answer:
LCM of 2,3,5,7 is 210
210min. = 3 1/2 hrs
next toll=9+3 1/ 2 = 12 1/2 Answer is ( d) 12.30pm
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