Question

Three subway lines arrive at a station at the same time. Line A arrives at the station every 20 minutes, Line B arrives every 24 minutes, and Line C arrives every 25 minutes. Calculate how long must you wait until all three lines arrive at the station at the same time again?

Answer 1

Answer:

we should wait 10hrs at the station

Step-by-step explanation:

here we should calculate lcm for 20m ,24m&25m

so accordingly

20=2²×5

24=2³×3

25=5²

lcm =2³×3¹×5²=600

600minutes =10hrs

Answer 2

Answer:

yes,it is right answer