A few days ago
write an equation to solve each problem.?
1) Two buses leave Houston at the same time and travel in opposite directions. One bus averages 55mi/h and the other bus averages 45mi/h. When will they be 400 mi apart?
2) The sides of a reactangle are in the ratio 3:2. What is the length of each side if the perimeter of the rectangle is 55cm?
Top 1 Answers
A few days ago
Favorite Answer
1) Remember:
Distance travelled, d, = average speed, s, xly by time, t, so,
d = s*t, and
d/s = t, and
d/t = s.
Now, the average speed of the buses is 45+55=100m.p.h,
and d = 400, so,
t = d/s, so,
t = 400/100, so,
t = 4 hours.
So the buses will be 400 miles apart after 4 hours.
2) If the sides are in the ratio 3:2, then let the sides be 3x, 3x,
2x, and 2x cm long. since the perimeter of the rectangle is
55cm, then
3x+3x+2x+2x = 55, so,
10x = 55, so,
x = 5.5cm, and the sides of the rectangle will be
3 xly 5.5 = 16.5cm, and
2 xly 5.5 = 11cm. Hope this helps, Twiggy.
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