Rate

A car wash facility can wash cars at the rate of 9 cars in 36 minutes. How many cars can be washed in 3 hours?

• 4.5

• 3

• 720

• 45

A motorist plans to travel 1273 km. If petrol costs $1.18 per litre and his car travels 19 km on 1 litre of petrol, how much will he need to spend on petrol for the trip?

• $1502.14

• $79.06

• $22.42

• $56.78

In a particular town, the temperature at midnight is -9^oC and it rises at a steady rate to reach a temperature of 39^oC at noon.

Find the rate of increase of temperature per hour.

• - 4^oC/h

• 4^oC/h

• 2.5^oC/h

• 3.25^oC/h

A piece of meat at -4^oC is thawed to room temperature.

The temperature rises at 2^oC/min.

How long will it take to reach 16^oC ?

• 2.7 mins

• 8 mins

• 10 mins

• 6 mins

The temperature at 04 00 was -11^oC . The temperature rose 1.4^oC per hour for the next 5 hours.

What was the temperature at 09 00?

• - 4^oC

• 7^oC

• 1.6^oC

• -18^oC

Printer A can print 30 pages in 2 minutes.

Printer B can print 75 pages in 3 minutes.

If both printers A and B are used at the same time, how long will it take to print 500 pages.

• 12.5 mins

• 4.8 mins

• 23.8 mins

• 12 mins

A group of 16 students can complete a project in 3 hours.

If 4 students were unable to turn up for the project right from the start,

how long would it take for the rest of the group to complete the project?

• 64 h

• 4 h

• 12 h

• 5 h

A candle is 25 cm long. After burning for 6 minutes, the candle is 21 cm long. What is the time duration taken for the remaining candle to burn out at the same rate?

• 14 mins

• 6 mins

• 31.5 mins

• 5 mins