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zlopas [31]
3 years ago
10

(−2)∙(2a−b)+3(a+b) plz help

Mathematics
1 answer:
tangare [24]3 years ago
3 0

Answer:

-a+5b

i hope this help you out ;)

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Two buses leave a station at the same time and travel in opposite directions. One bus travels 15 /kmh faster than the other. If
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Since the buses travel in opposite directions, the speed at which they distance themselves is the sum of their speeds.
One bus travels at speed s.
The other bus travels at speed s + 15.
The sum of the speeds is s + s + 15 = 2s + 15

speed = distance/time

distance = speed * time

366 = (2s + 15) * 2

183 = 2s + 15

168 = 2s

s = 84

The slower bus travels at 84 km/h.

s + 15 = 84 + 15 = 99

The faster bus travels at 99 km/h.

Check:
In 2 hours, the slower bus travels 2 * 84 km = 168 km
In 2 hours, the faster bus travels 2 * 99 km = 198 km
In 2 hours, the buses are 198 km + 168 km = 366 km apart.
Our answer is correct.
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3 years ago
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