There are four dogs/ants/people at four corners of a square
of unit distance. At the same instant all of them start
running with unit speed towards the person on their
clockwise direction and will always run towards that target.
How long does it take for them to meet and where?
Answer Posted / venkat
answer # 3 is almost correct. they will meet at the center however the time they would take according to my calculation is not 1 unit of time but less than 1 unit of time [approx 0.78 unit of time]. the reason being since all of the four are moving tracing arcs toward the center of the square, the distance of the arc is definitely less than 1 unit [little more than half the diagonal distance, half the diagonal distance is about = 0.707 unit]. the question says speed and not velocity. speed is distance traversed / time taken to cover the distance. Here distance is the length of the arc [0.78 unit] to be precise and not even half the diagonal distance [0.70 unit], leave alone the initial distance [1 unit] between the two people. arc length that I got was using this formula: (2 x pi x 0.5) / 4 = 0.78. Further 1 unit speed = 0.78 unit / time and it follows time = 0.78 unit of time.
Is This Answer Correct ? | 1 Yes | 2 No |
Post New Answer View All Answers
the probability of getting at least in a single through of three coins is
Starting from point A, Jayant walked 15m towards west. He turned left and walked 20 m. He then turned left and walked 15m. After this he turned right and walked 12m. in which direction is Jayant from X and how far has he walked from point X?
two trains are 2 kms apart. Speed of one train is 20m/s and the other train is running at 30 m/s. Lengths of the trains are 200 and 300m. In how much time do the trains cross each other?
what is the sum of 7 consecutive odd numbers with 27 as the fourth number
The committee on sexual discrimination in the workplace has highlighted Supremo Company as a chief offender. Of the twenty senior executives in the firm, only one is a woman. And of the forty junior executives, only five are female. Supremo could best defend itself against the charges by showing that .ten times more men than women apply for jobs with the company all job applicants who were rejected had fewer qualifications than those accepted they pay the same salary to senior men and senior women male and female executives at the same level have the same qualifications
if x=y=2z and xyz =256 then x=
2 persons start from a pt. and go in opposite directions. After going 3 km they turn left and walk 4 km . how far r they now?
There is 12 perls. One of them is either light or heavy than others. There is a weighing pan. How many trials are needed to find the exceptional one.
two, trains, one from howrah to patna and the other from patna to howrah, start simultaneously. After they meet, the trains reach their destinations after 9 hours and 16 hours respectively. What is the ratio?
One ship goes along the stream direction 28 km and in opposite direction 13 km in 5 hrs for each direction.What is the velocity of stream? `
One passage was on playing cards. know how many diamonds and etc.
3x+4y=10, x3 + y3=6, What is the minimum value of 3x+11y=?
Scientific publishing aptitude interview question
During a given week A programmer spends 1/4 of his time preparing flow chart, 3/8 of his time coding and the rest of the time in debugging the programs. If he works 48 hours during the week , how many hours did he spend debugging the program.
they asked the temperature problem.it was same as previous papers.the ratio was -t*t/6+4t+12.