Q21. 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. 24
B. 22.5
C. 25
D. 20.5
Q22. The ratio of the speed of a boat downstream and speed of the stream is 9:1. If the speed of the current is 3 km per hr, find the distance traveled by the boat upstream in 5 hours.
A. 109 km
B. 100 km
C. 105 km
D. 98 km
Q23. 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. 4 km/h
B. 12 km/h
C. 6 km/h
D. 10 km/h
Q24. Equal distance is covered by a boat in upstream and in downstream in total 5 hours. Sum of speed of a boat in upstream and downstream is 40 km/hr. Speed of boat in still water is 600% more than the speed of stream. Find the approximate distance covered by boat in downstream (in km).
A. 60
B. 45
C. 50
D. 55
Q25. A boat goes 4 km upstream and 4 km downstream in 1 hour. The same boat goes 5 km downstream and 3 km upstream in 55 minutes. What is the speed (in km/hr) of oat in still water?
A. 9
B. 6.5
C. 7.75
D. 10.5
Q26. Sravan drove from home to a neighboring town at the speed of 50 km/h and on his returning journey, he drove at the speed of 45 km/h and also took an hour longer to reach home. What distance did he cover?
A. 450 kms
B. 700 kms
C. 350 kms
D. 900 kms
Q27. A motorboat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the motorboat and speed of the water current respectively?
A. 8:3
B. 5:4
C. 3:7
D. 7:9
Q28. A boat can move 5 km/hr in still water. If the river is running at 1 km/hr, it takes it 75 min to move to a place and back. How far is the place?
A. 6 kms
B. 3 kms
C. 4 kms
D. 5 kms
Q29. Amith can row a boat d km upstream and the same distance downstream in 5 hours 15 minutes. Also, he can row the boat 2d km upstream in 7 hours. How long will it take to row the same distance 2d km downstream for Amith?
A. 4 hrs 1 min
B. 3 hrs 30 min
C. 4 hrs 10 min
D. 3 hrs 15 min
Q30. A motorboat can go 10 miles downstream on a river in 20 min. It takes 30 min for this boat to go back at the same 10 miles. Find the speed of the current?
A. 5 m/h
B. 6 m/h
C. 7 m/h
D. 8 m/h