Answer:
D: $7.80 per hour
Step-by-step explanation:
46.80/6 = 7.8
<span>Let x = time (minutes) it takes for the faster computer to do the job alone
then
12(1/30 + 1/x) = 1
</span><span><span>multiplying both sides by 30x:
12(x + 30) = 30x
12x + 360 = 30x
360 = 18x
20 minutes = x
</span><span>
</span></span>
Answer:
150
Step-by-step explanation:
3 times 50 equal 150