Boat and Stream Question No. 11 to 15 RS Aggarwal Objective Arithmetic Book

11) In a river, a man takes 3 hours in rowing 3km upstream or 15km downstream. What is the speed of the current?

(a) 2.5 km (b) 3 km (c) 4 km (d) 5 km

12) A boat running upstream takes 8 hours 48 min 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 boat and the speed of water current respectively?

(a) 2:1 (b) 3:1 (c) 8:3 (d) Cannot be Determined (e) NOT

13. A boat goes 6km in an hour in still water. It takes thrice as much time in covering the same distance against the current. Speed of the current is:

(a) 2km/hr (b) 3km/hr (c) 4km/hr (d) 5km/hr

14. A steamer goes downstream and covers the distance between two ports in 4hours while it covers the same distance upstream in 5 hours. If the speed of the stream be 2km/hr, the speed of the steamer in still water

(a) 16 km/hr (b) 18 km/hr (c) 24 km/hr (d) 36 km/hr

15. A boat goes 24 km upstream and 28km downstream in 6 hours. It goes 30km upstream and 21 km downstream in 6 hours and 30 minutes. The speed of the boat in still water is:

(a) 4 km/hr (b) 6 km/hr (c) 10 km/hr (d) 14 km/hr

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