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ITO
Jacky starts biking to meet up with her friend. She knows that if she bikes at a speed of
10 mph he will be 3 minutes late for the meeting. Jacky also knows that if she bikes at a
speed of 12 mph, she will be there 2 minutes before they agreed to meet. How much
time does she have left before the appointed time?

Respuesta :

fichoh

Using the speed - distance relationship, the time left before the appointed time is 27 minutes.

Recall :

  • Distance = speed × time

  • Let time = t

At 10mph :

  • Distance = 10 × (t + 3) = 10t + 30 - - - (1)

At 12 mph :

  • Distance = 12 × (t - 2) = 12t - 24 - - - - (2)

Equate (1) and (2) :

10t + 30 = 12t - 24

Collect like terms

10t - 12t = - 24 - 30

-2t = - 54

Divide both sides by - 2

t = 54 / 2

t = 27

Hence, the time left before the appointed time is 27 minutes.

Learn more : https://brainly.com/question/25669152

Answer:

7

Step-by-step explanation:

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