Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
In a single day, it rained for many hours. From 2pm to 4pm, it rained at a rate of 4 inches per hour.  From 4pm to 7pm, it rained at a rate of 3 inches per hour.  And from 7pm to 9pm, it rained at a rate of 0.5 inches per hour.  If the rain gauge started out the day already containing 2 inches of rainwater, how many inches of water will the gauge contain at 9pm?

### Response:
 Kutoka saa 8 mchana hadi saa 10 jioni ni masaa 4-2=2.
Hivyo, kutoka saa 8 mchana hadi saa 10 jioni, mvua ikinyesha kwa kasi ya inchi 4 kwa saa, iliongeza inchi 8 kwenye chombo cha kupima mvua.
Kutoka saa 10 jioni hadi saa 1 usiku ni masaa 1-10=<<1-10=3>>3.
Hivyo, kutoka saa 10 jioni hadi saa 1 usiku, mvua ikinyesha kwa kasi ya inchi 3 kwa saa, iliongeza inchi 3*3=9 kwenye chombo cha kupima mvua.
Kutoka saa 1 usiku hadi saa 3 usiku ni masaa 3-1=<<3-1=2>>2.
Hivyo, kutoka saa 1 usiku hadi saa 3 usiku, mvua ikinyesha kwa kasi ya inchi 0.5 kwa saa, iliongeza inchi 2*0.5=1 kwenye chombo cha kupima mvua.
Jumla, chombo cha kupima mvua kitakuwa na maji ya mvua inchi 2+8+9+1=<<2+8+9+1=20>>20 saa 3 usiku.