maths
posted by fathima .
the ghaziabad train passes every 20 minutes the faridabad train passses every 15 minutes the gurugaon train passes every 18 minutes it is 6 p m and all the train just passed by when is the next time that will happen

LCM(20,15,18) = 2^2 * 3^2 * 5 = 180
so, the time will be 9:00 pm when it happens again.
Respond to this Question
Similar Questions

math
At the "Neverlate" railroad station there are two tracks, A and B, both going to the city. At 7 A.M. a train leaves on each track, at the same time for the city. After that, the trains on track A leave every 8 minutes abd those on … 
algebra
tains A and train B are travling in the same dicrtion on a parral track train A is traving 60 mph and train B is traviling 70 mph train A passes a staion at 11.15 am and train B passes the same station at 11.45 am at what time will … 
grade five math
A freight train travel 100km every hour. It passes over a river at 10:00AM. Four hours later, a passenger train passes over the same river. The passenger train travels 150km every hour. When does the passenger train overtake the freight … 
MATHS
A TRAIN B SPEEDING WITH 120KMPH CROSSES ANOTHER TRAIN C, RUNNING IN THE SAME DIRECTION IN 2 MINUTES. IF THE LENGTH OF THE TRAIN B AND C BE 100M AND 200M RESPECTIVELY. WHAT IS THE SPEED OF THE TRAIN C 
Math Algebra
A quick question to check my answer. Trains A & B are travelling in the same direction on parallel tracks. Train A is travelling at 100 miles per hour and train B is travelling at 110 miles per hour. Train A passes a station at 2:10 … 
4th grade
trains begin to stop at terminal b every morning at 5 a.m. and then come every 20 minutes for the next 3 hours. mr success needs 15 minutes to get to terminal b from his house. .if mr. success leaves his house at 7:08 a.m., what is … 
Math
A train going 60 mph left several minutes before the 63mph train. Traveling on parallel tracks the faster train reaches the slower one in 3 hours. How many minutes head start did the slower train have? 
Math
An āAā train leaves a subway station every 12 minutes. An āEā train leaves every 9 minutes. If both trains just left the station on parallel tracks, when will both leave the station together again? 
math
train A arrives at central station on the hour and every 12 minutes. train B arrives on the hour and every 15 minutes. when do both train arrives at the same time. 
math
The rails on a railroad are 30 feet long. As the train passes over the point where the rails are joined, there is an audible click. The speed of the train in miles per hour is approximately the number of clicks heard in: A. 20 seconds …