Question

8(2 hr 40 min) multiplying and simplify

Answer 1

`\huge\boxed{8(2h\ 40min)=21h\ 20min}`

Explanation:

`1h=60min\\\\2h=2(60min)=120min\\\\2h\ 40min=2h+40min=120min+40min=160min\\\\8(2h\ 40min)=8(160min)=1280min\\\\1280:60=(1280)/(60)=(1260)/(60)+(20)/(60)=21+(20)/(60)\\\\1280min=21h\ 20min`

`\text{Other method}\\\\8\cdot2h=16h\\8\cdot40min=320min=300min+20min=5h+20min\\\\16h+(5h\ 20min)=21h\ 20min`