Question

Andre drove part of a 260 km trip at 80kph and the rest at 100kph. Find the distance he traveled at 80kph if his total time was 2hr 30min

Answer 1

What do i do after that?

Answer 2

ahh i see, so i would have to find a common denominator right?

Answer 3

100t + 80 ( 2.5 - t) = 260
Can you continue from here?

Answer 4

Yeah thanks! :)

Answer 5

Would you like to show your work so we can double check ?

Answer 6

100t + 20 - 8t = 260

100t - 8t = 240

92t = 240

t = 2.61

Is that right?

Answer 7

How do you distribute 80 into the bracket?
80 ( 2.5 - t) = ....?

Answer 8

ohh, i thought that was an 8..not an 80

Answer 9

So could you fix your error now?

Answer 10

Yes

100t + 200 - 8t =260

Answer 11

-80 i mean

Answer 12

Yes, continue please!

Answer 13

100t + 200 - 80t = 260

100t - 80t = 60

20t = 60

t = 3

Answer 14

Yes, don't forget the unit t = 3 hrs, though!

Answer 15

Now find the distance he travels with 80 km/h?

Answer 16

Right, and now i just plug it in

Answer 17

is it d = v times t
which would be d = 80 x 3 = 240?

Answer 18

Let me double check!

Answer 19

All right

Answer 20

Are you sure the number in your post is correct?

Answer 21

Since the total of hours is 2.5 hrs, it's impossible that t = 3 hrs

Answer 22

Yeah im sure..that's what i was thinking..

Answer 23

Is there no solution?

Answer 24

If you're sure that your post is correct, then bring this solution to your teacher, point it out that the logic of question is questionable !

Answer 25

Do you have any question?
BTW, you should learn careful when copying down the number and practice your calculating skill more!

Answer 26

@santosrubi_5 By any chance that you copy the number 260 instead of 230?
If so: 20t = 30
-> t = 1.5 hrs
=> d = 80 ( 2.5 - 1.5) = 80 Km