Question

a train travels along a straight line at a constant speed of 60 mph for a distance d and then another distance equal to 2d in the same direction at a constant speed of 8 mph what is the average speed of the train for the whole journey​

Answer 1

Answer:

average speed =average distance/time taken

=3d+d/(d/60+2d/8)---------------(time =distance/speed)

=21.1 mph

Explanation:

Answer 2

3. A train travels along a straight line at a constant speed of 60 miles/h for a

distance d and then another distance equal to 2d in the same direction at a

constant speed of 80 miles/h.

a) What is the average speed of the train for the whole journey?