a traveler traveled for 6 hours and covered a distance of 520km. he travelled the first 260km by car and the rest of the way by train. the average speed of the care is twice the average speed of the train. what is the average speed of the train?
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Step-by-step explanation:
let average speed of train is x km/hour
so, average speed of car is 2x km/hour
he travel 260 km by train
time =260/2x hour
rest of the distance (520-260) km=260 km
so,
260/x+260/2x=6
=
(520+260)/2x=6
=> 780=12x
=> x=780/12
=> x=65
average speed of train is 65 km/hour
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