Question

A bus service centre has 2 feed services that start together at 8.00 am .bus A leaves at 15 min interval,bus B leaves at 20 min interval. On a particular day,how many times do both services leave together from 8 a.m.to 11 a.m ?

Answer 1

the both services leave together from 8 am to 11 am = 21 times
well if u think something like y am i EXPLAINING !! well its cus i want to make myself clear. the buses leave within 3 hours so how many times the buses come in 1 hour ?
bus  A                                               bus B
1 hour = 4                                        1 hour = 3 
4 x 3 cus 3 hours = 12                            3 x 3 cus 3 hours = 9
12 + 9 = 21 
hope it helps u 
 
 

Answer 2

Answer:

Step-by-step explanation: The LCM of 15 and 20 is 60min or 1hr

They together leave from 8am to 11am

Hence 11hr-8hr=3hr

Therefore no of times do both services leave together =3/1=3 times

The required answer is 3times