Question 620346
A car travels at a constant speed of 60 km/h for hours, stops for half an hour and then travels for another 2 hours at a constant speed of 80 km/h, reaching its destination. 
Construct a function that describes the distance travelled by the car, d (km), at time, t hours
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let t=total hours of travel
distance=travel time*speed
distance=60(t-2.5)+80(2)
distance=60t-150+160
d(t)=(60t+10) km