A train traveled 1/5 of the distance between two cities in 3/4 hour. At this rate, how many hours will it take the train to travel the entire distance between these two cities

1/5 is equal to the 20% of the trip and that took 45 minutes.

45minutes/20% of traveled distance = X minutes / 100% travel distance

2.25 * 100 = X

225 = X

So if for the 1/5 or 20% of the trip lasted 3/4hour or 45 minutes. To complete the trop you need 225 minutes or 3 hours and 45 minutes or 3 3/4 hours.