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r-ruslan [8.4K]
3 years ago
15

Lydia drives from city a to city b to transport goods. her return speed is 3 times her departure speed and she takes 40 minutes

less on her return trip. how long did her departure trip take?
Mathematics
1 answer:
gizmo_the_mogwai [7]3 years ago
4 0

Answer:

1 hour

Step-by-step explanation:

Hello, let's say that her departure trip takes t in minutes, as her return speed is 3 times her departure speed, she took t/3 for the return and we know that this 40 minutes less, so we can write.

t/3=t-40

We can multiply by 3

t = 3t -40*3 = 3t - 120

This is equivalent to

3t -120 = t

We subtract t

2t-120 = 0

2t = 120

We divide by 2

t = 120/2 = 60

So this is 60 minutes = 1 hour.

Thank you.

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