Question

I need help with this question:

An airliner flies 2000 km at a speed of 1600 km/h and then returns due to bad weather at a speed of 1000 km/h. Find the average speed for the whole trip.

Answer 1

average speed =total distance/total time

Answer 2

here total distance equal = total distance of return trip=2000+2000
time =distance / speed=2000/1600 + 2000/1000

Answer 3

I don't get it

Answer 4

Can you please explain again?

Answer 5

Somebody? Anybody?

Answer 6

First,
speed* time = distance

if we divide both sides by "speed" we get
time = distance/speed

Using
2000 km at a speed of 1600 km/h

how long did it take the plane to travel 2000 km ?

can you do that ?

Answer 7

It's okay, I already solved it

Answer 8

I'll show you what I did

Answer 9

First, we must get the time for the first part of the journey. That would be:

2000/1600= 1.25 hours (multiplied by 60= 75 mins, so 1 hour 15 mins)

Then,

2000/1000= 2 hours

2+1.25= 3.25 hours ( 3hours and 15 mins)

So, to get the avg. speed:

Total distance, which is, 4000 divided by 3.25 hours

4000/3.25=1230 km/h (about)

Thanks for helping anyway : )

Answer 10

yes

Answer 11

though you rounded to the nearest tenth. more accurately 1230.77 km/h

Answer 12

Yes, that's what I did

Answer 13

I rounded it to the nearest tenth

Answer 14

But it doesn't really matter, right?