Answer:
(10,2)(20,4)(30,6)(40,8)
Step-by-step explanation:
In each bracket the first digit divided by the second is equal to 5
10÷2=5
20÷4=5
30÷6=5
40÷8=5
Answer: 57 min
i used a calculator.
to find the adverage you have to add the times together then divide them by 2 so 2 + 1.5 = 3.5/2= 1.75