tolong bantu sekasang yaa.. teeimakasih

waktu ketik 1 jam = 1200 kata = 1200:60 = 20 kata per menit
1 3/4 jam = 75 menit = 20 x 75
= 1500 kata

1800 kata : 20
= 90 menit

a. 1 3/4 x 1200 = 7/4 x 1200 = 2100 kata

b. 1800/1200 = 1,5 jam = 1 1/2 jam