Question

What is the average speed of a train that travels at 100km/hr for 6 hours and then 120km/hr for 5 hours

Answer 1

Step-by-step explanation:

First off, you'd wanna get the distance for the

Distance = Speed * time; Speed = Distance / time

Avg. Speed = Total Distance / total time

First case: 100 * 6 = 600 km

Second case: 120 * 5 = 600km

Next, you add the distances - 600 + 600 = 1200km

Then divide by the total time which is 6 + 5 = 11 hours

1200 / 11 = 109.1 km/hr

OR

You can simply add both speeds and divide by 2 which would only give an estimate. (100+120)/2 = 110 km/hr

Answer 2

Step-by-step explanation:

Average speed = Total distance / Total time.

100 km/hr

r = 100 km / hr

t = 6 hours

d = 6 * 100 = 600 km

120 km / hr

r = 120 km / hr

t = 5 hour

d = 120 * 5

d = 600 km

Total distance = 600 + 600 = 1200 km

Total time = 5 hour + 6 hours = 11 hours.

Average speed = 1200 km / 11 hours = 109.1