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

### Instruction:
A pipe is clogged so that only 2 ounces of cleaner can run through the pipe per minute. After fifteen minutes, the cleaner has unclogged it enough that 3 ounces can run through per minute. Ten minutes later, the clog is cleared enough for 4 ounces to run through per minute. How many ounces of cleaner were used after 30 minutes?

### Response:
 Kwa dakika kumi na tano kwa unga wa 2 kwa dakika, 2 * 15 = <<2*15=30>>30 unga ulitumika.
Kwa dakika kumi zilizofuata kwa unga wa 3 kwa dakika, 3 * 10 = <<3*10=30>>30 unga ulitumika.
Kuna dakika 30 - 15 - 10 = <<30-15-10=5>>5 zilizobaki.
Kwa dakika tano zilizofuata kwa unga wa 4 kwa dakika, 4 * 5 = <<4*5=20>>20 unga ulitumika.
Baada ya dakika thelathini, jumla ya unga uliotumika ni 30 + 30 + 20 = <<30+30+20=80>>80 unga.