How long would it take a car to return to its starting place if it traveled 180km

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GENOCIDELYTS

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at an average speed of ...? How long would it take a car to return to its starting place if it traveled 180km at an average speed of 90km/hr and returned to its starting place along the same straightline path? (Neglect the time that the car takes to turn around)
 
both ways equal distance (d)
v(average) = 90 = d/t1 (going)
v(average) = 90 = d/t2 (coming) >>>>> t1=t2
180 = d+d = 90[t1+t2]
t1+t2 = 2 hours
T = 2 hours
 
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