Aman travels 600km partly by train and partly by car. if he covers 400km by train and the rest by car, it takes him 6 hours and 30 minutes. but if he travels 200 km by train and rest by car, he takes half an hour longer. find the speed of the train and that of the car

Eric has challenged himself to walk 24,000 steps in 4 days. if eric walks the same number of steps each day, which function represents the number of steps eric still needs to walk to reach his goal with respect to the number of days since he started his challenge? a. y = 8,000x − 24,000 b. y = -8,000x + 24,000 c. y = 6,000x − 24,000 d. y = -6,000x + 24,000