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A car is traveling at a constant speed of 120 km/h down a road for 3 hours. If it starts 400 km away from its destination, how close will it be at the end?

a) 40 km
b) 280 km
c) 360 km
d) 520 km

1 Answer

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Final answer:

To find out how close the car will be to its destination after 3 hours, we calculate the distance traveled (120 km/h × 3 h = 360 km) and subtract it from the starting distance (400 km - 360 km = 40 km). Hence, the car will be 40 km from its destination.

Step-by-step explanation:

To determine how close the car will be to its destination after traveling at a constant speed of 120 km/h for 3 hours, we need to calculate the distance it covers in that time. The distance traveled is the product of the speed and the time of travel. Using the formula:

Distance = Speed × Time

The distance traveled by the car is:

Distance = 120 km/h × 3 h = 360 km

Since the car starts 400 km away from its destination, we subtract the distance traveled from the initial distance to find the remaining distance:

Remaining Distance = Initial Distance - Distance Traveled

Remaining Distance = 400 km - 360 km = 40 km

Therefore, the car will be 40 km away from its destination after 3 hours of travel at 120 km/h, which corresponds to option (a).

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