1E Chapter 8 Ratio, Rate and Speed

Simplify  $1\ \frac{1}{2}:\ 2\ \frac{2}{5}$  

Simplify  $0.105\ :\ 0.350$  

Given that  $a\ :\ b\ =\ 5\ :\ 8$  and  $b\ :\ c\ =\ 3\ :\ 10\$ , find the ratio  $a\ :\ b\ :\ c$  

The monthly salaries of Jack and Jill are in the ratio 5 : 9. The monthly salary of Jack is $3200 more than that of Jill. Find the monthly salary of Jill.

The exchange rate between Singapore dollars (SGD) and US dollars (USD) is 1 SGD = 0.74 USD. The exchange rate between Australian dollars (AUD) and US dollars (USD) is 1 AUD = 0.71 USD.

Find the exchange rate between SGD and AUD in AUD/SGD. Leave your answer in 3 decimal places.

A man took  $4\ \frac{1}{2}$  hours to drive 360 km from Singapore to Kuala Lumpur. He used 37.5 litres of petrol for the journey. Find his average speed in km/h

A man took  $4\ \frac{1}{2}$  hours to drive 360 km from Singapore to Kuala Lumpur. He used 37.5 litres of petrol for the journey. Find the petrol consumption rate in km/l

Express the speed 25 m/s in km/h. 

Bobby walks at an average speed of 4 km/h for one hour and then cycles 6 km at 12 km/h. Find his average speed for the whole journey. (Round your ans to 3sf)

If  $2a\ =\ 3b$  , find  $a\ :\ b$