Question

A bus service number 4 leaves a terminus every 20 minutes. Service bus 8 and 3 leaves ever 25 and 30 minutes respectively. If all the three services leave together at 6.00 a.m, at what other times during day time do they leave together?

Answer 1

2	20	25	30
2	10	25	15
3	5	25	15
5	5	25	5
5	1	5	1
	1	1	1

2x2x3x5x5= 300 minutes
300/60= 5 hours
  6:00
+5:00
11:00 am