A) 1 hour
B) \[\text{1}\frac{1}{2}\]hours
C) \[2\frac{1}{2}\] hours
D) 3 hours
Correct Answer: D
Solution :
Tolling together for next time means tolling after the least possible seconds which is the L.C.M. of 9, 12 and 15. L.C.M. \[\text{=3}\times \text{3}\times \text{4}\times \text{5=180}\]minutes \[=\frac{180}{60}\]hours \[=3\]hoursYou need to login to perform this action.
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