a construction crew can clear 1/2 ton of dirt in 90 minuntes. How much dirt can they clear in 4 hours?

It's about 2,666.7 pounds but that is about 1.33335 tons.

change 90 minutes to hours = 90 minutes * 1 hour/60 minutes = 1.5 hours

1/2 ton / 1.5 hours = x tons / 4 hours

use cross products

1/2 * 4 = x * 1.5

divide by 1.5 on each side

1/2 * 4/1.5 = x

2/1.5=x

4/3

They will clear 4/3 tons