The first thing to notice with this question is that the volume of the tank is given in cm3 yet the rate at which the water leaks is in litres, so a conversion of units will be neccessary. We know that there are 1000cm3 for every litre so 45000cm3 is equivilent to 45 litres (45,000/1000 = 45). So what do we know now? Well the tank of water contains 45 litres, and every minute 0.75 litres is lost, so our objective is to find out how many miuntes go by before the tank is empty. In other words how many 0.75s go into 45, luckily division can help us out. 45/0.75 = 60 minutes.

Mark brainliest please

Hope this helps you

5 0

2 years ago

A math textbook is 1 1/4 in. thick. how much shelf space is needed for 30 copies of the book?

inysia [295]

Hello!

You have to multiply 1 1/4 by 30 because each math book is 1 1/4 in. thick, and 30 books is 1 1/4 by 30. First change 30 and 1 1/4 to an improper fraction.

$\frac{30}{1} \times \frac{5}{4} = \frac{150}{4} = 37 \frac{1}{2}$

$\framebox{37 1/2 inches}$

8 0

3 years ago

an airplane travels 400 miles Against The Wind in 4 hours and makes the return trip with the same wind in 2 hours find the speed

xxTIMURxx [149]

400 miles -----------4 hours
X miles ------------2 hours

4x=400.2
4x=800
X=200

Or

400miles --------------- 4hours
X miles --------------- 6 hours

4x=400.6
4x=2.400
X= 600

3 0

4 years ago