A moter boat covers a certain distance downstream in a river in 3 hours.It covers the same distance upstream in 3 hours and a half.If the speed of water is 1.5 km/h,then the speed of the boat in still water is :
1). 17 km/h
2). 19.5 km/h
3). 17.5 km/h
4). 19 km/h
The speed of a boat in still water is 6 kmph and the speed of the stream is 1.5 kmph.A man rows to a place at a distance of 22.5 km and comes back to the starting point The total time taken by him is :
1). 10 hours
2). 4 hours 10 minutes
3). 6 hours 10 minutes
4). 8 hours
A boat can travel with a speed of 13 km/hr in still water. If the speed of stream is 4 km/hr in the same direction, time taken by boat to go 63 km in opposite direction is
1). 9 hrs
2). 4 hrs
3). 7 hrs
4). $3\frac{9}{17}$ hrs
A man can row at a speed of $4\frac{1}{2}$ km/hr in still water. If he takes 2 times as long to row a distance upstream as to row the same distance downstream, then, the speed of stream (in km/hr) is
1). 1
2). 1.5
3). 2
4). 2.5
A person can row $7\frac{1}{2}$ km an hour in still water and he finds that it takes him twice as long to row up as to row down the river.The speed of the stream is :
1). 2 km/hr
2). 3 km/hr
3). $2\frac{1}{2}$ km/hr
4). $3\frac{1}{2}$ km/hr