Question

At a railway junction , trains started from 5 different platforms at 3,4,8,12,15 min interval. At 7: 30 AM train started from all 5 platforms. When will they start again together .

Answer 1

Answer:

at 9:30am thay will start again together

Answer 2

Answer:

9:30 am

Step-by-step explanation:

first take the lowest common factor of 3,4,8,12,15 min.

the LCM is 120

60 minute is equal to 1 hour

120 min equal to 2 hour

train started from all 5 platforms = 7:30 am

Next time when they will start again together is 7: 30 am + 2 hour = 9:30 am