speed, distance, time calculations powerpoint.pdfa train travelled 555 miles at an average speed of...
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Speed, Distance, Time Calculations
Speed is how fast something is going or the distance something moves in a given amount of time.
Speed = distance
----------
time
Speed is measured in miles per hour
Speed is also measured in kilometers per hour
Measurement Unit
Speed Miles/Hour or Km/Hour
Distance Miles/Kilometers
Time Hours
Jack runs around the 1 mile track in 7 minutes. What is his speed?
- Speed is measured here in miles/hour
- How do we get 7 minutes into hours? - 7 minutes 1 hour
60 minutes
7/60 = .12 hours
15 mins = _____ Hours
.25 Hours
30 minutes = _____ hours
.5 hours
3 hours 45 minutes = _____ hours
3.75 Hours
D
S T
The 3 formulas for Speed, Time & Distance:
Speed = Distance
Time Time =
Distance
Speed Distance = Speed x Time
Remember them from
this triangle:
D
S T
Solving for Speed Solving for Time Solving for Distance
D
S T
A windsurfer travelled 28 km in 1 hour 45 mins.
Calculate his speed.
Speed = Distance
Time
28
1.75 =
= 16 km/h
1 hour 45 mins
Answer: His speed was 16 km / hour
2 hour 30 mins
Answer: He travelled 125 km
A salesman travelled at an average speed of 50 km/h for 2 hours 30 mins. How far did he travel?
D
S T Distance = Speed x Time
= 50 x 2•5
= 125 km
Answer: It took 9 hours 15 minutes
A train travelled 555 miles at an average speed of 60 mph. How long did the journey take?
D
S T Time =
Distance Speed
555 60 =
= 9•25 hours = 9 hours 15 mins
Your dad traveled 75 miles in 2.5 hours. What was his speed?
30 miles/hour
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Yolanda travels 240 kilometers in 4 hours. What was her average speed?
60 miles/hour
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Mikes speed was 20 km/hour. He traveled for 10 hours. How many kilometers did he drive?
200 kilometers
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