Question

Three students can wash a car in 16 minutes. If the time varies inversely with the number of students washing the car, how many minutes will it take two students to complete the job?

a. 20b22c.24d. 32/3

Answer 1

Let
x----------> the number of students
y---------> the time in minutes

we know that
If the time varies inversely with the number of students
so
y=k/x
for x=3
y=16 min
16=k/3---------> k=48

y=48/x
for x=2
y=48/2-------> y=24 minutes

the answer is
24 minutes