Three clocks were set to true time and starts to run together, makes a beep sound at intervals of 8,10 and 12 minutes respectively. In 2 days, how many times do they will make the sound together ?  Choose the correct choice.
A) 12
B) 15
C) 25
D) 30
E) 35
Explanation :   The clocks make sound at intervals of 8, 10 and 12 minutes respectively.   The LCM of 8,10 and 12 is 120.   So, the clocks will make sound together after every 120 minutes. i.e., after every 2 hours.   In 2 days(48 hours), they will make the sound together   (48/2)= 
<gadget id="calculator">  (48/2)</gadget>
<output>24</output>
24 times.   At the end of 2nd day, they will make one more beep together.   Therefore, totally (24+1) 25 times beep sound is made together.   Hence the answer is 25 times.   Answer : 25
<result>C</result>
Three clocks were set to true time and starts to run together, makes a beep sound at intervals of 8,10 and 12 minutes respectively. In 2 days, how many times do they will make the sound together ?