Question

a truck traveled at an average speed of 87 kilometers per hour, and traveled for 7 hours. about how many kilometers did the truck travel? use rounding to choose the estimate. 560-630 80-90 1120-1260 700-800

Explanation:

Step1: Recall the formula for distance

The formula for distance \( d \) is \( d = \text{speed} \times \text{time} \). Here, speed is 87 km/h and time is 7 hours.

Step2: Round the speed

To estimate, we round 87 to the nearest ten. 87 is closer to 90, but also we can check the lower bound by rounding to 80.

• If we take 80 (lower bound): \( 80 \times 7 = 560 \)
• If we take 90 (upper bound): \( 90 \times 7 = 630 \)

So the distance should be between 560 and 630 when we round 87 to 80 or 90 and multiply by 7.

Answer:

560–630