Respuesta :
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
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