Boats and Streams Practice Problems Set – 1
1. The
current of a stream runs at the rate of 4 km/hr. A boat goes 6 km and back to
the starting point in 2 hours. The speed of the boat in still water is ?
a) 6 km/hr
b) 7.5 km/hr
c) 8 km/hr
d) 6.8 km/hr
e) 7.2 km/hr
2. A boat
moves upstream at the rate of 1 km in 10 minutes and downstream at the rate of
1 km in 6 minutes. The speed of the current is ?
a) 1 km/hr
b) 1.5 km/hr
c) 2 km/hr
d) 2.5 km/hr
e) 3 km/hr
3. A man
rows upstream 16 km and downstream 28 km talking 5 hours each time. The
velocity of the current is ?
a) 2.4 km/hr
b) 1.2 km/hr
c) 3.6 km/hr
d) 1.8 km/hr
e) 1.6 km/hr
4. A man
can row at 5 km/hr in still water and the velocity of current is 1 km/hr. It
takes him 1 hour to row to a place and back. How far is the place ?
a) 2.5 km
b) 2.4 km
c) 3 km
d) 3.6 km
e) 3.8 km
5. A man
can row 44 km downstream in 4 hours. If the man's rowing rate in still water is
8 km/hr, then find in what time will he cover 25 km upstream ?
a) 5 hours
b) 6 hours
c) 4.5 hours
d) 4 hours
e) 5.5 hours
6. A boat
travels upstream from B to A and downstream from A to B in 3 hours. If the
speed of the boat in still water is 9km/hr and the speed of the current is 3
km/hr the distance between A and B is ?
a) 4 km
b) 6 km
c) 8 km
d) 12 km
e) 15 km
7. A man
can swim 3 km/hr in still water. If the velocity of the stream be 2 km/hr, the
time taken by him to swim to a place 10 km upstream and back is ?
a) 8 1/3 hrs
b) 9 1/5 hrs
c) 10 hrs
d) 12 hrs
e) 12 2/5 hrs
8. A man
can row three quarters of a kilometre against the stream in 11 1/ 4 minutes and
return in 7 1/2 minutes. The speed of the man in still water is ?
a) 2 km/hr
b) 3 km/hr
c) 4 km/hr
d) 5 km/hr
e) 6 km/hr
9. A man
can row 9 1/3 in still water and he finds that it takes him thrice as much time
to row up than as to row down the same distance in river. The speed of the
current is ?
a) 3 1/3 km/hr
b) 3 1/2 km/hr
c) 1 1/4 km/hr
d) 4 2/3 km/hr
e) 1 1/2 km/hr
10. The
current of a stream runs at 1 km/hr. A motor boat goes 35 km upstream and back
again to the starting point in 12 hours. The speed of motor boat in still water
is ?
a) 6 km/hr
b) 7 km/hr
c) 8.5 km.hr
d) 8 km/hr
e) 9 km/hr
