Question 4
a) The speed of a boat in still water is 15 km/h and the rate of current is 3 km/h. Find the distance travelled downstream in 30 minutes.
b) A man rows 18 km upstream in 5 hours and also 28 km downstream in 5 hours. Find the velocity of the stream.
c) If a man can swim downstream at 6 km/h and upstream at 2 km/h, find his speed in still water.
Motion convention: in each part the current and still-water speeds are constant, with the same still-water speed in both directions.
Answer entry: Enter the integer answers for (a);(b);(c), in that order, separated by semicolons, without units or spaces. Use km for (a) and km/h for (b) and (c).
b) A man rows 18 km upstream in 5 hours and also 28 km downstream in 5 hours. Find the velocity of the stream.
c) If a man can swim downstream at 6 km/h and upstream at 2 km/h, find his speed in still water.
Motion convention: in each part the current and still-water speeds are constant, with the same still-water speed in both directions.
Answer entry: Enter the integer answers for (a);(b);(c), in that order, separated by semicolons, without units or spaces. Use km for (a) and km/h for (b) and (c).