Activity: Solve each problem involving average speed. Be sure to show all solutions and to use
the correct units
1. Mana drives her car for 1 ½
hours with a constant speed of 65 km/h and then for another 60
minutes with a constant speed of 80 km/h. What was her average speed?
2. Slyvette rides her bike for 120 minutes with a constant speed of 30 km/h and then for another 6 hours with a constant speed
of 20 km/h. What is her average speed for the total trip?
the correct units
1. Mana drives her car for 1 ½
hours with a constant speed of 65 km/h and then for another 60
minutes with a constant speed of 80 km/h. What was her average speed?
2. Slyvette rides her bike for 120 minutes with a constant speed of 30 km/h and then for another 6 hours with a constant speed
of 20 km/h. What is her average speed for the total trip?
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SOLUTION: Total distance=
1.)1/2 •65+80•1=177.5km
TOTAL TIME;1+1 1/2=2,5h
Arerage Speed: 177,5÷2,5=7/km/h
2.)TOTAL DISTANCE=
120/60×30+6×20=180km
TOTAL TIME,120/60+6=8Hours
Arerage Times:180/8=22,5km/h