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First term = 3.2 x 1 = 3.2 Last term = 3.2 x 32 = 102.4 Required average = (3.2 + 102.4)/2 = 52.8
A swimmer swims from a point A against a current for 12 minutes and then swims backwards in favour of the current fornext 12 minutes and comes to the po...
Find the total distance covered by boat in each upstream and downstream in 5 hours if the speed of boat in still water and speed of current is 20 km/h a...
A man can row 8 km/hr in still water. If the speed of the current is 2 km/hr, it takes 5 hours more in upstream than in the downstream for the same dist...
A boat running downstream covers a distance of 50 km in 2(1/2) hrs and the same distance upstream in 10 hrs. What is the speed of the boat in still water?
A boat covers 45 km downstream in 90 minutes. If the ratio of the speed of the boat in still water to that of the speed of the stream is 5:3, respective...
A man row a boat 1 km in 5 min, along the stream and 6 km in 1hrs against the stream, The speed of the stream will be
The speed of the boat in still water is 6 km/hr and the speed of the stream is 3 km/hr. A boat goes 108 km downstream with its usual speed but at the ti...
A boat covers 315 km upstream in 7 hours and 525 km downstream in 7 hours. Find the time taken by the boat to cover 420 km in still water.
A boat takes 2 hours 20 minutes to cover 140 km downstream and 2.5 hours to cover 75 km upstream. If the boat covers 'y' km upstream and '2y' km downstr...
