Others Maths Puzzle

There are 4 timer machines. 1st machines beeps after every 30 mins. 2nd machine beeps after every 1 hr. 3rd beeps after every 1.30 mins and 4th beeps after every 1.45 mins. At 12 noon all machines beeps at the same time. Next At which time they will all 4 machines beep at a time?

Read Solution (Total 3)

at 9 AM
Taking lcm of all four timing of beeps i.e. 30 ,60 ,90 ,105 min.=1260 min.=21 hrs.
So time of next beep,after 12 noon will be at 9 AM.
11 years agoHelpfull: Yes(7) No(0)

At 9.00 AM
11 years agoHelpfull: Yes(1) No(0)
6.30 p.m
lcm of 30,60,90,105=630 minutes hence it takes 6hr 30min to beep again
11 years agoHelpfull: Yes(0) No(6)

Others Other Question

how many such digits are there in the number 52361984 each of which is far way from the beginning of the number as when the digits are rearranged in ascending order within the number? A ship sailing on a sea contains 3 theives.They altogether have a bag containing 100 gold coins.They are not ready to share it equally,b'coz they are greedy.They all desire to get it for themselves.One of them is a leader.The leader should give an idea such that he should win the majority of five.ie,3votes including himself.He is allowed to give an idea only once.If he does'nt win the majority at the very first time,he'll be thrown into the sea.Give the idea for the leader such that he can earn maximum.