The current in the river has a speed of 2 km/hr. Michelle can't paddle too well since she broke her hand. She can paddle downstream 6 km and then upstream 6 km to his starting point in the same number of hours as she can paddle 16 km in still water. What is Michelle's speed in still water? Let r = Michelle's speed in still water a) Write an expression for the time it takes Michelle to travel 16 km in still water. tstill = b) Let rup be Michelle's speed upstream. Write an expression for rup based on r. rup = c) Let rdown be Michelle's speed downstream. Write an expression for rdown based on r. rdown = d) Write an expression for the total time it takes Michelle to paddle upstream 6 km and downstream 6 km.