a car covers 57 km in 1.5hours how long will it take to cover 342 km
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Car covers distance of 258 km in 3 hours and 35 minutes .
3 hours and 35 minutes = (3*60)+35 =215minutes .
Distance cover by car in one minute =258/215 =1.2 km .
Hence, speed of car = (1.2*60)/60 = 72km/hr .
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