22. A train travels 3 hours at 20km per
hour. How long will it take another
train to travel the same distance at
10km per hour?
(a) 6²/³ hours
(b) 6¹/2hours
(c) 6 hours
(d) 3 hours
(e) 2 hours
ans

6 hours will it take another train to travel the same distance .What is speed? Speed indicates the rate of movement of something or someone. If you know the distance traveled and the time it took, you may calculate an object's average speed. Speed is calculated as distance times speed.Average speed = Total distance/Total time     A train travels 3 hours at 20km per hour.  train travels 20 km in 1 hours.       then in 3 hours train travels = 3 * 20 = 60 km  total speed = 10 km/hr           t = distance/speed            = 60/10 = 6 hours Learn more about Speed brainly.com/question/28224010#SPJ13