A traveller covers 600 km in 8 hours, partly by train at 80 km/h and the rest by car at 60 km/h. How many kilometres did he travel by train?
Correct answer C. 480 km
Explanation
x/80 + (600 − x)/60 = 8. Multiplying by 240: 3x + 2400 − 4x = 1920, so x = 480 km by train.
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