Tutor MathsGuru: Ask me for your burning Maths questions!

[Guan Hui]

Daddy:

Dear maths guru,


Need help!!

Area of triangle problem.
1) The area of the triangle is 1/16 of the area of the rectangle. If the total area of the rectangle and triangle is 252 cm2. Find the perimeter of the rectangle.

http://i222.photobucket.com/albums/dd39/tham33/area.jpg\">

Thanks

What is the box beside the triangle and rectangle?

[firebird]

Dear Mathsguru


Please help me on the following:

At 8am a bus starts to travel from Jorhor Bahru to Kuala Lumpur. 2 hours later, a car starts from Johor Bahru and travels along the same route. The car over takes the bus at 1pm. If the speed of the car is 30km/h faster than the bus, find
a) the speed of the bus
b) the speed of the car

Many thanks
firebird

[trytry]

firebird:

Dear Mathsguru


Please help me on the following:

At 8am a bus starts to travel from Jorhor Bahru to Kuala Lumpur. 2 hours later, a car starts from Johor Bahru and travels along the same route. The car over takes the bus at 1pm. If the speed of the car is 30km/h faster than the bus, find
a) the speed of the bus
b) the speed of the car

Many thanks
firebird

Time taken by bus from 8am to 1pm = 5 h
Time taken by car from 10am to 1 pm= 3h
(note: distance travelled the same)

Ratio of time taken by
bus:car
5 : 3

therefore ratio of speed of the
bus : car
3 : 5

difference of speed ratio=5-3=2u

2u =30
1u = 30/2=15


a) Speed of the bus = 3u = 3x15=45km/h
b) Speed of the car = 5u= 5x15=75km/h

[firebird]

Dear try try


Thank you. Now I got it.

Regards
firebird

[david59]

firebird:

Dear Mathsguru


Please help me on the following:

At 8am a bus starts to travel from Jorhor Bahru to Kuala Lumpur. 2 hours later, a car starts from Johor Bahru and travels along the same route. The car over takes the bus at 1pm. If the speed of the car is 30km/h faster than the bus, find
a) the speed of the bus
b) the speed of the car

Many thanks
firebird

If both the bus and the car were to set off at the same time from 10am to 1pm which is 3 hours, the car would have been 90km ahead of the bus.

Speed of car is 30km/h faster than bus. So, 30km x 3hrs = 90km

In actual fact, the bus was 90km away from the starting point when the car set off at 10am. Since the bus set off at the starting point at 8am and was 90km away at 10am,
therefore 90km divide by 2hrs = 45km/hr

The speed of the bus was 45km/hr.

[Daddy]

Hi,


the value of the box 12m height.

thanks

[Guan Hui]

hi daddy,(this sounds weird lol)


I think is 12cm?
cause its 252cm^2

I don’t know if I am correct cause the answer have decimals

0.5xbxh+Lxh=252
0.5xb+L=21
b+2L=42

16x0.5xbxh=Lxh
8b=L
2L=16b

17b=42
b=42/17
L=8b=19+13/17
2L=39+9/17
2h=12x2=24
Perimeter =39+9/17 +24
(63+9/17)cm or 63.53cm

[firebird]

Dear david59


I thank you for the answer.

Regards
firebird

[KoalaMummy]

i need an urgent answer to this question, by tonight… hope you don’t mind…

A book cost $12 more than a magazine. 2 magazine and 5 books cost $110. Find the cost of a book and a magazine.

[verykiasu2010]

KoalaMummy:

i need an urgent answer to this question, by tonight.. hope you don't mind...

A book cost $12 more than a magazine. 2 magazine and 5 books cost $110. Find the cost of a book and a magazine.

M + $12 = B

5M + $60 = 5B

therefore 2M + (5M + $60) = $110

7M = $50

M = $7 1/7

B = $19 1/7