Related Questions

If a boat goes a certain distance at 30 km/hr and comes back the same distance at 60 km/hr. What is the average speed (in km/hr) for the total journey?
A 45
B 50
C 40
D 35
If a boat goes upstream at a speed of 21 km/h and comes back the same distance at 28 km/h. What is the average speed (in km/hr) for the total journey?
A 24.5
B 24
C 25
D 25.4
If a boat goes upstream at a speed of 18 km/hr and comes back the same distance at 30 km/hr. What is the average speed (in km/hr) for the total journey?
A 22.5
B 24
C 20.5
D 25
A person goes from point N to P and comes back. His average speed for the whole journey is 60 km/hr. If his speed while going from N to P is 40 km/hr, then what will be the speed of the person (in km/hr) while coming back from P to N?
A 80
B 100
C 120
D 140
The ratio of the speed of boat in still water to the speed of stream is 16 :5. A boat goes 16.5 km in 45 minute upstream. Find the time taken by boat to cover the distance of 175 km downstream.
A 30minutes
B 25minutes
C 50minutes
D 45minutes
The ratio of the speed of boat in still water to the speed of stream is 16: 5. A boat goes 16.5 km in 45 minute upstream . Find the time taken by boat to cover the distance of 17.5 km downstream .
A 30 minutes
B 25 minutes
C 50 minutes
D 45 minutes
The ratio of the speed of boat in still water to the speed of stream is 16 : 5. A boat goes 16.5 km in 45 minute upstream , find the time taken by boat to cover the distance of 17.5 km downstream .
A 30 minutes
B 25minutes
C 50 minutes
D 45 minutes
A boat covers a certain distance downstream in 1 hour, while it comes back in 1.5 hour. If the speed of the stream be 3 km/hr. What is the speed of the boat in still water?
A 12 km /hr
B 15 km/hr
C 13 km/hr
D 14 km/hr
A boat has a crack in its bull which is leaking water into the boat and could pump which can pump the water out in 8 hours . If the boat is 168 km away from the shore and the pump is running what is the minimum speed the boat should run at so that it can reach the shore before sinking?
A 5km./hour
B 6 km/hour
C 7 km/hour
D 8km/hour
A steamer moves with a speed of 4.5 km/h in still water to a certain upstream point and comes back to the starting point in a river which flows at 1.5 km/h. The average speed of steamer for the total journey is
A 12 km\/h
B 10 km\/h
C 6 km\/h
D 4 km\/h

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