Sheldon Hui's answer to Ria's Secondary 2 Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Sheldon Hui
Sheldon Hui's answer
6 answers (Tutor Details)
The answer for both part a) and b) require use of ratio and proportion. Know that 1km = 1000m and 1m= 100cm. If it takes a longer time, just stick to what you already know and go step by step backward.