Ateam can row 40 km in 2 hours when rowing with the current but only 16 kilometers in 2 hours when rowing against the current determine the team's round speed when there is no current

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post

Idon't know what's the answer lol