Multiple choice

The ratio between the speed of a train and a car is 20 : 19 respectively. Also, a bus covered a distance of 640 km in 8 h. The speed of the bus is 4/5 th of the speed of the train. How much distance will the car cover in 7 h?

  1. 655 km

  2. 645 km

  3. 665 km

  4. 685 km
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bus speed = 640 / 8 = 80 km/h. Train speed = 80 / (4/5) = 100 km/h. Ratio of train to car = 20:19, so car speed = (19/20) * 100 = 95 km/h. Distance for car in 7h = 95 * 7 = 665 km.

AI explanation

The speed of the bus is 640 km / 8 h = 80 km/h, so the speed of the train is 80 * (5/4) = 100 km/h. Given the ratio of the train's speed to the car's speed is 20:19, the car's speed is 100 * (19/20) = 95 km/h. Therefore, the distance the car covers in 7 h is 95 km/h * 7 h = 665 km.

Keep practicing — related questions