Discussion :: Races and Games - General Questions (Q.No.3)
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A wins by 20 m.| Kriti said: (Dec 3, 2010) | |
| Hi, when 3:4 is the ratio of speeds how can we use it as 3m and 4m for A and B resp.? |
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| Sudheer said: (May 19, 2011) | |
| Hi kriti here speed and distance are directly proportinal. If his speed is 10km/hr he cover 10km distance. If speed is 20km/hr he can cover 20 km distance. Thus speed and distance are directly proportinal. So here distance ratios also become3:4. But the time ratio will become4:3 because time and speed are inversly proportinal. | |
| Vamsi said: (Jul 5, 2011) | |
| I didn't understand how it can be 4/3. ? | |
| Malli said: (Sep 30, 2011) | |
| Hai, my dout is same that of vamsi. Why we had taken 4/3 in problem? |
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| Manojit said: (Feb 9, 2012) | |
| While A covers 3 m, B covers 4 m. While A covers 1m, B covers 4/3 m. While A covers 360 m, B covers (4/3* 360)m =480 m. Here time is same in case of speed.we count different distance in same time. |
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| Rajesh said: (Feb 7, 2013) | |
| Can be solved by simple calculation. A covers 360m (ie) 500-140. Ratio of speeds of A:B = 3:4. Let us consider A covers 3m/sec & B covers 4m/sec. Time taken by A to cover 360m=(360/3)=120seconds. So,Distance covered by B in 120s =120*4=480m. Therefore,A wins by 20 metres which is (500-480). |
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| Srinu said: (Feb 8, 2015) | |
| Time = dis\speed. T = 360\3 = 120sec. Now dis = sxT = 4x120 = 480m. So 500-480 = 20m. This is the answer. |
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| Newstein Faraday . said: (Jul 1, 2015) | |
| A has to travel 360 meters therefore Time =distance/ speed. So 360/3 = 120 seconds. The same 120 seconds b has to travel so distance = speed x time = 4 x 120 = 480. The remaining distance that b has to travel is 500-480 = 20. |
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| Damini.arora said: (Aug 25, 2015) | |
| Here, because A has a start of 140, he has already covered 140 m when B starts. So when A covers rest of 360, B covers 480. Hence B loses race by 20 m. |
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| Ash said: (Jan 19, 2016) | |
| Speed is directly proportional to distance. 3/4 = (500-140)/(500-x). 3/4 = 360/(500-x). Hence x = 20. |
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| Anand said: (Sep 1, 2019) | |
| Here is the simplest method, Speed ratio is 3:4 SO let consider 3m & 4m for both A & B. A travels 360 and B travels 500. This means A takes 120 seconds and B takes 125 seconds. 5 seconds more than A is travelled by B. In one B travels 4m. So in 5 seconds, 5*4=20m. B travels 20m more than A. That is A win by 20m. |
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| BKD said: (Dec 1, 2020) | |
| 3/4 = (500-140)/x. x = 480. Thus, In 500 m race, A gives B by 20m i.e.500-480. |
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| ANUPCHERRY said: (Jun 29, 2021) | |
| A : B =140M. 3X + 4X =7X, 140/7 = 20M. |
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| Yadu said: (May 26, 2022) | |
| How come we take 3 as 3m and 4 as 4m If time is not a constant here? Anyone, explain to me. |
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