Question

Tim paddles his kayak 12 km upstream against a 3km/h current and back again in 5 hours and 20 minutes. In that time, how far could he have paddled in still water?

Answer 1

d=rt

Answer 2

let the speed in still water be v say.

time taken to go upstream t1 = 12/ v - 3

time taken to come downstream t2 = 12/ v + 3

t1 + t2 = 5 hours and 20 minutes
--> 16/3 hours

(12/ v - 3) + (12/ v + 3) = 16/3

solve this to find v.

u will get v= 6 km/h (solve and recheck urself :) )

after finding v multiply the velocity with total time 16/3 hours to get distance covered in still water.

that is 6*16/3= 32km this is a hard question but i think this should be right