Question

Please help me with hw​

Answer 1

Step-by-step explanation:

Since, Carlos completes the work in 5 hours.

So, in one hour she will do $=\frac{1}{5}$ part

Since, Jenny completes the work in 9 hours.

So, in one hour she will do $=\frac{1}{9}$ part

(Carlos + Jenny)'s one hour work together

$=\frac{1}{5}+\frac{1}{9}\\= \frac{9+5}{5\times 9}\\= \frac{14}{45}$

Total time taken by Carlos and Jenny together $=\frac{45}{14}= 3\frac{3}{14} \: hours$

Answer 2

Answer:

4. 7 hours   6. 8.57

Step-by-step explanation: