A boat goes 40 km upstream in 8 hours and 36 km downstream in 6 hours. The speed of the boat in still water is :
1). 6.5 km/hour
2). 5.5 km/hour
3). 6 km/hour
4). 5 km/hour
A man rows 750 m in 675 seconds against the stream and returns in $7\frac{1}{2}$ minutes. Find his rowing speed in still water.
1). 3 kmph
2). 4 kmph
3). 5 kmph
4). 6 kmph
A boat goes 20 km downstream in one hour and the same distance upstream in two hours. The speed of the boat in still water is
1). 15 km/hr.
2). 10 km/hr.
3). 5 km/hr.
4). 7.5 km/hr.
A person can row a distance of one km upstream in ten minutes and downstream in four minutes. What is the speed of the stream
1). 4.5 km/h
2). 4 km/h
3). 9 km/h
4). 5.6 km/h
A swimmer swims from a point A against a current for 5 minutes and then swims backwards in favour of the current for next 5 minutes and comes to the point B. If AB is 100 metres,the speed of the current (in km per hour) is:
1). 0.4
2). 0.2
3). 1
4). 0.6