To clean the water tank each tap in a house was kept open for some time. There were 2 taps in the house numbered I and II with different draining capacities. Initially tap I was opened alone and could empty 23 of the tank in 5 hours. After that both the taps were opened together and the remaining tank could empty taking 2 more hours. How much time will the tap II alone take to empty the full tank

Ihonestly don’t understand this at all

Estimate the product. round the first factor to the nearest whole number, round the second factor to the nearest ten, and then multiply. 3 8/9 × 96

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?