Explanation:

Let’s break this down:

- Car B drives at 50 km/hr for 7.5 hours.

- Distance = 50 × 7.5 = 375 km.

- Car C travels 400 km at 20% less speed than Car B.

- 20% less than 50 km/hr ? 50 × 0.8 = 40 km/hr.

- Time for Car C = 400 ÷ 40 = 10 hours.

- As for Car A: it goes 33 1/3% more distance than B. That’s 1/3 more, so 375 + (1/3 × 375) = 375 + 125 = 500 km. But that info isn’t needed for this answer.

So, the correct answer is:

Option 2, 10 hours