Car A runs at the speed of 50 km/hr and reaches its destination in 8 hours. Car B runs at the speed of 70 km/h and reaches its destination in 4 hours. What is the ratio of distances covered by Car A and Car B?  Choose the correct choice: A) 3 : 7 B) 4 : 9 C) 10 : 7 D) 5 : 7 E) 6 : 11

Rationale: "car a travels 50 × 8 = 400 km car b travels 70 × 4 = 280 km the ratio is 400 : 280 = 40 : 28 = 10 : 7 the answer is c ."
Answer: C