Question

506. A bulldozer excavated 555 m of earth in 3 hours. How many cubic meters did another bulldozer excavate in 4 hours, if itexcavated 15 m’more per hour than the first bulldozer?​

Answer 1

Ответ:

800 m

Пошаговое объяснение:

1)555:3=185 (m) per hour

2)185+15=200 (m) per hour second buldozer

3)200*4=800 (m)

Answer 2

Let's first find out how much earth the first bulldozer excavated per hour:

$\text{Rate of first bulldozer} = \frac{555 \text{ meters}}{3 \text{ hours}} = 185 \text{ meters per hour}$

The second bulldozer excavated 15 meters more per hour than the first bulldozer. So, its rate is:

$\text{Rate of second bulldozer} = 185 \text{ meters per hour} + 15 \text{ meters per hour} = 200 \text{ meters per hour}$

Now, we can find out how much earth the second bulldozer excavated in 4 hours:

$\text{Excavation by second bulldozer} = \text{Rate of second bulldozer} \times \text{Time}$ $= 200 \text{ meters per hour} \times 4 \text{ hours} = 800 \text{ meters}$

So, the second bulldozer excavated 800 cubic meters of earth in 4 hours.