Speed 1 (About calculating speed)
What is the formula to calculate speed?
Speed = Distance ÷ Time
What is the formula to find time?
Time = Distance ÷ Speed
What is the formula to find distance?
Distance = Speed × Time
What does it mean “per”?
Each
A boy travels 60 km in 2 hours. What is his speed?
Speed = 60 ÷ 2 = 30 km/h
A car travels 100 km at a speed of 50 km/h. How long does it take?
Time = 100 ÷ 50 = 2 hours
A car travels at 50 km/h for 2 hours. How far does it go?
Distance = 50 × 2 = 100 km
A car moves at a speed of 40 km/h for 3 hours. How far does it travel?
Distance = Speed × Time = 40 × 3 = 120 km
A train travels 240 km at 80 km/h. Find the time.
Time = 240 ÷ 80 = 3 hours
A cyclist moves at 20 km/h for 3 hours. Find the distance traveled.
Distance = 20 × 3 = 60 km
A train travels 300 km at a speed of 75 km/h. How long does the journey take?
Time = Distance ÷ Speed = 300 ÷ 75 = 4 hours
A bus travels 150 km at 60 km/h. How many minutes does the journey take?
Time = 150 ÷ 60 = 2.5 hours
2.5 hours = 2 hours 30 minutes
Answer: 2 hours 30 minutes
A bus travels at 60 km/h for 1.5 hours. How far does it travel?
Distance = 60 × 1.5 = 90 km
A car covers 120 km at 60 km/h and another 120 km at 40 km/h. What is the average speed?
Total distance = 120 + 120 = 240 km
Time₁ = 120 ÷ 60 = 2 hours
Time₂ = 120 ÷ 40 = 3 hours
Total time = 5 hours
Average speed = 240 ÷ 5 = 48 km/h
A car travels 90 km at 45 km/h and then 60 km at 30 km/h. How much total time does the trip take?
Time₁ = 90 ÷ 45 = 2 hours
Time₂ = 60 ÷ 30 = 2 hours
Total time = 4 hours
A car travels for 2 hours at 40 km/h and then for 1 hour at 60 km/h. Find the total distance.
Distance₁ = 40 × 2 = 80 km
Distance₂ = 60 × 1 = 60 km
Total distance = 140 km