Answer:
5
Step-by-step explanation:
5 (l)x4(h)=20
(l)=laps
(h)=Hours
Answer:
4 hours
Step-by-step explanation:
Ratio of working together
Job : number of hours
1 : 3 = 1/3
Trainer
Job : number of hours
1 : x = 1/x
Trainee
Job : number of hours
1 : 3x = 1/3x
1/x + 1/3x = 1/3
Multiply through by 3x
3x(1/x) + 3x(1/3x) = 3x(1/3)
3 + 1 = x
4 = x
x = 4 hours
It takes the trainee 4 hours to finish the job
Answer:
x = 3
Step-by-step explanation:
Answer: 90
Step-by-step explanation: Multiply each side by 18.
