Q1. The speed of a boat in still water is 5 km/hr and speed of current is 3 km/hr. If time taken to cover a certain distance upstream is 8 hours, then how long will the boat take to cover the same distance downstream?
(a) 2.5 hrs.
(b) 3 hrs.
(c) 2 hrs.
(d) 3.5 hrs.
(e) 1.5 hrs.
Q2. Downstream speed of a boat is 5 km/hr more than its upstream speed and the speed of boat in still water is 280% more than the speed of sream. Find the total time taken by boat to travel 42 km in downstream and 31.5 km in upstream?
(a) 7 ½ hr
(b) 8 hr
(c) 9 hr
(d) 9 ½ hr
(e) 10 hr
Q3. Speed of stream of river is 20% of speed of boat in downstream and time taken to cover 48 km in upstream is 4 hr. and speed of boat in still water is equal to speed of train A which cross a standing man in 36 sec. Then find length of train A ?
(a) 220 m
(b) None of these
(c) 240 m
(d) 120 m
(e) 160 m
Q4. Find the speed of stream if a boat covers 36 km in downstream in 5 hours which is 3 hours less in covering the same distance in upstream.
(a) 1.35 km/hr
(b) 1.24 km/hr
(c) 1.15 km/hr
(d) 2.2 km/hr
(e) None of these
Q5. Time taken by boat to cover 164 km in upstream is 50% more than time taken by boat while returning. Find the time taken by man to cover 100 km in still water if speed of man is equal to speed of boat in still water and speed of stream is 10 km/hr?
(a) 4 hr
(b) 6 hr
(c) 5 hr
(d) 2 hr
(e) 3 hr
Solutions
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