tolong kak y dengan cara no 15sampai 21

15. 2 1 /4 jam + 75 menit = ... detik
= 2 1/4 x 3.600 + 75 x 60
= 8.100 detik + 4.500 detik
= 12. 600 detik A

16. Volume = debit x waktu
= 500 L/menit x (1 x 60)menit
= 500 L/menit x 60 menit
= 30.000 L
= 30 m^3

17. (9 kg + 10 pon + 40 ons) - 1.000 gram
= (9 kg + (10 : 2) kg + (40 : 10) kg) - (1.000 : 1.000) kg
= (9 kg + 5 kg + 4 kg) - 1 kg
= 18 kg - 1 kg
= 17 kg

18. Jarak = kecepatan rata rata x waktu
= (10.35 - 8.15) x 150 km/jam
= 2,20 jam x 150 km/jam
= 330 km

19. B.

20. C

21. C