Speed, Distance, Time Calculations

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Presentation transcript:

Speed, Distance, Time Calculations

The aim of this lesson is to be able to use the correct formulas to calculate speed, distance or time

15 mins = 0•25 hour 30 mins = 0•5 hour 45 mins = 0•75 hour Reminder: How to change minutes into a decimal 15 mins = 0•25 hour So: 3 hours 15 mins = 3•25 hours 30 mins = 0•5 hour So: 7 hours 30 mins = 7•5 hours 45 mins = 0•75 hour So: 2 hours 45 mins = 2•75 hours

The 3 formulas for Speed, Time & Distance: Speed x Time Solving for Speed Solving for Time Solving for Distance D S T Remember them from this triangle:

Answer: His speed was 16 km / hour A windsurfer travelled 28 km in 1 hour 45 mins. Calculate his speed. Distance Time D S T Speed = 28 1•75 = 1 hour 45 mins = 16 km/h Answer: His speed was 16 km / hour

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 2 hour 30 mins = 125 km Answer: He travelled 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 Distance Speed Time = 555 60 = = 9•25 hours = 9 hours 15 mins Answer: It took 9 hours 15 minutes