Lester and Ralph work at an athletic shoe store in the mall, but whenever they goof off too much, their boss punishes them by making them lace-up all the inventory. I f it takes Lester 30 seconds to lace up a high top and Ralph 35 seconds to do the same, how many seconds will it take them to lace-up 260 high tops?

4200

Step-by-step explanation:

Time taken by Lester 30 seconds

Time taken by Ralph = 35 seconds

Their rate :

Lester = 1/time taken = 1/30

Ralph = 1/ time taken = 1/35

Combined rate:

1/30 + 1/35 = (35 + 30) / 1050 = 65 / 1050 = 0.0619047 per boot

Time taken = number of boots / combined rate per boot

Time taken = 260 / 0.0619047

Time taken = 4200 seconds

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490

5050

hope this !