81 5——6 Xiaoqiang, you have already made 7 / 10 of the whole journey from tunnel a to place B. if each branch is 90 meters, you can reach place B in 6.5 minutes. How many meters are there between a and B? A project team dug a 4.2km canal in 24 days, 1 / 5 more than the actual number of days. How many kilometers were actually dug every day?

81 5——6 Xiaoqiang, you have already made 7 / 10 of the whole journey from tunnel a to place B. if each branch is 90 meters, you can reach place B in 6.5 minutes. How many meters are there between a and B? A project team dug a 4.2km canal in 24 days, 1 / 5 more than the actual number of days. How many kilometers were actually dug every day?

1.90×6.5÷(1—7/10)
=1950 M
2. How many x kilometers are actually dug every day
4.2÷X×(6÷5 )=24
X = 0.21 km