deleted.

We need to solve this

-16t^2 + 60t = 56 rearrange as

16t^2 - 60t + 56 = 0 divide through by 4

4t^2 - 15t + 14 = 0 factor

(4t - 7) (t - 2) = 0

Set each factor to 0 and solve for t and we get 7/4 sec and 2 sec

7/4 sec is correct = 1.75 sec