Question

a person takes a trip hi driving with a constant speed of 90 km per hour except for 30 minutes fresh shop is a person average speed is 75 km per hour how much time you spend on trip and how far does the person travel

Answer 1

distance=90km/hr * (time-.5)
but distance/time=75
75time=90*(time-.5hr)
15*time= 45hr
time driving= 15 hr
how far? 75*15 km