A=1/10, b=1/12, c=1/15 (these are the rates for each worker...)
1.)
2(1/10)+4(1/12)+t/15=1
1/5+1/3+t/15=1
(3+5+t)/15=1
3+5+t=15
8+t=15
t=7
So it would take c 7 hours to finish the job.
2.)
1/40-1/60
(3-2)/120
1/120
The drain rate is 1/60. So you will need to find t when the tank is empty, while starting at 2/3 capacity...
2/3-t/60=0
(40-t)/60=0
40-t=0
t=40
It would take 40 minutes to empty the tank when it is 2/3 full.
<span> 80 divide by 68 is 1.17647058824</span>
Answer:
7 800 pour 1/2 heure
Step-by-step explanation:
15 600/2=7 800
Answer:
answer C
Hyperbolic geometry
The sum of the angles of a hyperbolic triangle is less than 180°.
Answer:
I am 76 years old.
Step-by-step explanation:
If my age is x years then:
200 - 2x = 48
-2x = - 152
x = 76.
