I am extremely confused and unsure of this an despite many Teachers explaining i

Ask Singapore Homework?

Upload a photo of a Singapore homework and someone will email you the solution for free.

Question

secondary 3 | E Maths
One Answer Below

Anyone can contribute an answer, even non-tutors.

Answer This Question

secondary 3 E Maths Singapore

I am extremely confused and unsure of this an despite many Teachers explaining it to me may I know why is it 1/2 times 40 times X? Like why is it times X ? Cuz ik that triangle formula is 1/2 times base times height but X doesn’t seem to be the height pls clarify this for me thank u!! Pls also explain the workings and ans!

Date Posted: 4 years ago

Comments 1 add a comment

AC Lim

4 years ago

X label wrongly. It should be height. Since the distance travelled from 40s to Ts is the area, hence use ratio of 2:3.
2 unit —> 20x
3 unit —-> 20x X 3/2 = 30x
Time from 40 to T = distance(30x) / speed(x).
= 30 s
Or use area of rectangular formula
Area = 30x
(40 to T) time x= 30x
(40 to T) = 30.
.
.
Hope this helps