There are two sand clocks(timers) one complete totally in 7
minutes and other in 9-minutes we have to calculate with
this timers and bang the bell after completion of 11-
minutes!plz give me the solution.

Answer Posted / rayudu

You can ring the bell When the 7 min clock completes 10 min
and the 9 min clock completes 12 min


Sol: One complete round takes 8 min per both
If you ring the bell at 11 min First clock shows 10min and
second clock shows 12min
(10+12)/2=11min

Is This Answer Correct ?    3 Yes 7 No



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