cclappm8697
21.06.2019 •
Mathematics
Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?
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Ответ:
The faster cyclist's speed is 14mph
Step-by-step explanation:
Before I explain this, remember that Distance=Time*Speed.
For now let's suppose the slower cyclist's speed is x mph, and the faster cyclist's speed is 2x mph, because he/she is going 2 times faster.
Both cyclists have been biking for 4 hours, so to find the distance they both travelled in that time, we multiply each of their speeds by 4 (hrs).
So for the slower cyclist, it is x*4=4x miles
And for the faster cyclist, it is 2x*4=8x miles
They cyclists meet after the 4 hours, which means that if you add the distances they travelled in that 4 hours together, you will get 84 miles.
Let's make an equation out of this: 4x+8x=84
Now we solve for x:
4x+8x=84
12x=84
x=7
Now we know that x=7, so all we have to do is go back to the beginning, and remember when I said, we would suppose the slower cyclist's speed is x mph and the faster cyclist's speed is 2x mph? Exactly. We plug 7 in for x and we get 7 mph for the slower cyclist's speed and 14 mph (7*2) for the faster cyclist's speed.
Hope this made sense :)
Ответ:
s = 2v + 1
2v + 1 + v = 10
3v + 1 = 10
3v = 10 - 1
3v = 9
v = 9/3
v = 3 < === 3 hrs volleyball
s + v = 10
s + 3 = 10
s = 10 - 3
s = 7 < === 7 hrs soccer