Proportion and speed

Worksheet: Proportion and speed

Name:Class:

Answer the questions.

1. If 3 pens cost $6 and the price is in direct proportion, how much do 5 pens cost?
   a) $10b) $12c) $15d) $8
2. If two quantities are in direct proportion, doubling one doubles the other.
   a) Trueb) False
3. A recipe uses 200 g flour for 4 people. How much flour for 10 people?
   a) 450 gb) 500 gc) 550 gd) 800 g
4. Which pair of values is in direct proportion?
   a) 1 : 3 and 4 : 10b) 1 : 3 and 4 : 12c) 2 : 5 and 4 : 9d) 3 : 6 and 5 : 9
5. 8 notebooks cost $24. Using the unitary method, what is the cost of one notebook?
   a) $16b) $2c) $3d) $4
6. 7 identical apples weigh 560 g. What do 12 apples weigh, in grams?
7. Which is the better buy? A: 5 kg for $10. B: 3 kg for $7.50.
   a) Ab) Bc) Both are the samed) Cannot tell
8. Juice: 500 ml costs $1.20 and 2 litres costs $4.00. Which is cheaper per litre?
   a) Cannot tellb) The 2 litre bottlec) The 500 ml bottled) They cost the same
9. A car travels 150 km in 3 hours. What is its average speed?
   a) 153 km/hb) 30 km/hc) 450 km/hd) 50 km/h
10. A cyclist riding at 12 km/h for 2.5 hours travels 30 km.
    a) Trueb) False
11. A train goes at 80 km/h. How long does it take to travel 200 km?
    a) 16 hoursb) 2 hoursc) 2.5 hoursd) 3 hours
12. A runner covers 600 m in 2 minutes. What is her speed in metres per minute?
13. Which unit is most suitable for the speed of a snail?
    a) cm per minuteb) kg per hourc) km per hourd) m per second squared
14. A speed of 36 km/h is the same as 20 m/s.
    a) Trueb) False
15. Convert 10 m/s into km/h.
    a) 10 km/hb) 100 km/hc) 3.6 km/hd) 36 km/h
16. A bus drives 45 km in 45 minutes. What is its speed in km/h?