it takes eight hours for a 600 km journey, if 480 km is done by train and the rest by car It takes 20 minutes more. if 400 km is done by train and the rest by car. the ratio of the speed of train to that of the car is?
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Step-by-step explanation:
Let the speed of the train be x km/hr and that of the car be y km/hr.
→ 120/x + 480/y =8 ⇒ 1/x + 4/y=1/15 ......(1)
→ 200/x + 400/y = 25/3 ⇒1/x + 2/y = 1/24 .........(2)
→ solving (1) and (2) we get x=60 and y=80
∴ ratio of speeds = 60:80 = 3:4
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