Verified answer

1.) Find the average speed: Distance = 612 miles Time = 12 hours.

Speed Formula: Speed = distance ÷ Time

Solved:

• Speed = distance ÷ Time
• Speed = 612 miles ÷ 12 hours
• Speed = 51 mph

2.) Andrea cycles 9 km on her bike in 2 hours. Calculate her average speed in kilometers per hour.

Speed Formula: Speed = distance ÷ Time

Solved:

• Speed = distance ÷ Time
• Speed = 9 km ÷ 2 hours
• Speed = 4.5 km/h

3.) Jose drives at 140 km in 2 hours. Calculate his average speed in

Speed Formula: Speed = distance ÷ Time

a. km/h

Solved:

• Speed = distance ÷ Time
• Speed = 140 km ÷ 2 hours
• Speed = 70 km/h

b. m/sec

Solved:

• 70 km/h ÷ 3.6
• 19.44 m/sec

4.) A bus travels for 3 hours at 60 km/h and then for 2 hours at 63 km/h. What is the average speed for the whole journey?

Speed Formula: Speed = distance ÷ Time

Solved:

• Speed = distance ÷ Time
• [tex]\bold{Speed = \frac{(60\:\:km/h \times\:3\:h)\:+ \:(63\:\:km/h \:\times\:2\:h)}{3h\:+\:2h}}[/tex]
• [tex]\bold{Speed = \frac{180\:km\:+ \:120\:km}{3h\:+\:2h}}[/tex][tex]\bold{=\frac{300\:km}{5\:h}}[/tex]
• Speed = 60 km/h

5.) John and his friend took 4-hour bicycle trip. In all, they traveled 150 km. What was their average rate of speed?​

Speed Formula: Speed = distance ÷ Time

Solved:

• Speed = distance ÷ Time
• Speed = 150 km ÷ 4 hours
• Speed = 37.5 km/h