11. A boat moves with a speed of 13 km/h downstream and 7 km/h upstream. Find the speed of the boat and stream.Sol: B + W = 13B – W = 7B = 10 km/hW = 3 km/h Answer Video Solution on Youtube 12. A man can row 45 km upstream and 66 km downstream in 15 h....
31. In a 1 km race, the speeds of A and B are in the ratio of 5 : 3 and A wins by 10 seconds. Find the time taken by B to finish the race and distance covered by B when A finishes the race.Sol:Distance is constant∴ Time ∝...
21. A and B run a race of 2000m. First A gives B a start of 200m and beats him by 30 sec. Next, A gives B a start of 3 minutes and is beaten by 1000m. find the time in minutes in which A and B can run the race...
11. In a race of 400m, A gave B a head start of 20m at the start of the race. B took 48 seconds to complete the race. What was the speed of A if B defeated A by a margin of 2 seconds...
21. In a class, the ratio of number of girls to boys is 1:2. If the average weight of boys is 55 kg and the average weight of girls and boys is 50 kg then find the average weight of...
11. In two alloys A and B the ratio of zic to tin is 5:2 and 3:4 respectively. 7kg of alloy A and 21kg of the alloy B are mixed together to form a new alloy. What will be the ratio of zinc and tin in the new alloy...
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