A pool has a capacity of 4,000 litres. Mr. Osborne starts filling the empty pool with water at a rate of 20 L/min. The pool springs a leak after 20 minutes and water
leaks out at 2 L/min. Beginning from the time when Mr. Osborne starts filling the
empty pool, how long does it take until the pool is completely full?
A 4 hours
B 3 hours 20 minutes
C 3 hours 40 minutes
D4 hours 20 minutes
E 3 hours

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.

step-by-step explanation:   divide the numerator by the denominator to get the decimal

it would still be 193

if divide by 100 then 1.93

i am not sure