1 answer:
Answer:
Step-by-step explanation:
Let the distance be d and average speed be v.
Half of the distance the speed was 2/3v
Let the speed be xv in the second half of the distance.
<u>Then time is:</u>
- d/v = d/2 : (2/3v) + d/2 : (xv)
- d/v = 3/4(d/v) + (1/2x)(d/v)
- 1 = 3/4 + 1/2x
- 1/2x = 1 - 3/4
- 1/2x = 1/4
- 2x = 4
- x = 2
The rest of the road car has to ride with speed of 2v
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(10n-6) + (10-35n)
Second step is to combine like terms:
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Answer: (25n+4)
