Two cars start simultaneously from the same point, one traveling east at 50 km/h and the other traveling north at 70 km/h. How far apart are they after 2 hours?
Show answer & explanation
Correct answer: D
Explanation
In 2 hours,
Distance covered by the first car = 50 × 2 = 100 km
Distance covered by the second car = 70 × 2 = 140 km
The two directions are perpendicular to each other.
Distance = √(100² + 140²)
= √(10000 + 19600)
= √29600
= 20√74
≈ 172.68 km