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 / elavenil

There are two sand clocks(timers) one complete totally in 4
minutes and other in 9-minutes we have to calculate with
this timers and bang the bell after completion of 7-
minutes!plz give me the solution.

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