2 men at same tym start walking towards each other from A n
B 72 kms apart. sp of A is 4kmph.Sp of B is 2 kmph in 1st
hr,2.5 in 2nd, 3 in rd. n so on…when will they meet i in 7
hrs ii at 35 kms from A iii in 10 hrs iv midway
Answers were Sorted based on User's Feedback
Answer / somy
midway.
72/2 = 36kms.....the distance midway
A to cover 36 takes 9hrs (9*4)
B in 9 hrs cover 36 also (2+2.5+....+6 = 36)
hence midway
Is This Answer Correct ? | 122 Yes | 5 No |
Answer / rana
Distance covered by A in 9hours= 9*4=36kms
Distance covered by B in 9 hours=
(2.5+3+3.5+4+4.5+5+5.5+6)=36kms
so A,B meet in the midway i.e 72/2=36kms
Tank you
Is This Answer Correct ? | 46 Yes | 4 No |
Answer / deepak
After the first hour, they are
4+2=6 km closer to each other. After the second hour, they are
4+2.5=6.5 km closer to each other, and so on. The reduction of distance per hour is therefore an arithmetic progression:
6, 6.5, 7, ...
with initial value a=6 and common difference d=0.5.
The arithmetic series (adding these distances) can be expressed in terms of hours, h, as
S(h) = ah + dh(h-1)/2
= 6h + 0.5(h^2-h)/2
= 6h + (h^2-h)/4
and they meet when this sum equals 72:
6h + (h^2-h)/4 = 72
24h + h^2 - h = 288
h^2 + 23h - 288 = 0
(h - 9) (h + 32) = 0
We have no interest in a negative solution, so the positive one h=9 is the one we want. They meet after 9 hours.
That doesn't match either of the answers that are times, so let's check the distance from A, which at a steady 4 km/h is clearly 36km, half the total distance.
They meet midway (answer iv).
Is This Answer Correct ? | 7 Yes | 4 No |
Answer / dinesh
after 8 hours
because after 8 hours A has traveled 32 km,
and B has travelde 30 km,
at that time the meet
Is This Answer Correct ? | 17 Yes | 62 No |
If it is possible to make only one meaningful word with the second, the third, the sixth and the eighth letters of the word FRAGMENT, using each letter only once, then which of the following will be the third letter of that word? If no such word can be formed, the give ?X? as the answer and if more than one such words can be formed, then give ?Y? as the answer. (a) A (b) E (c) T (d) X (e) Y
Eon asked 60 students whether they listen to two popular radio stations, WROK and WRAP. He found that 23 listen to WROK, 18 listen to WRAP, and 8 listen to both. How many students in Robert's survey listen to a) WROK but not WRAP b) WRAP but not WROK c) neither WROK nor WRAP
area of trapezium
A batsman average was 15.at last innings he took 23 runs then his average became 16.how much run he should take to make his average 18?
the plane question was asked.it took off from 7 degree 53' 6.1'' and landed at 8 degree 6' 43.5''.it takes 12 hours to travel between these points.then what will be local time at destination ?
A man driving the car at twice the speed of auto oneday He was driven car for 10 min. And car is failed. He left The car and took auto to goto the office .He spent 30 min. In the auto. What will be the time take by car to go office? (A) 25 (b) 30 (c) 35 (d) none
What is the difference between monkey testing,gorilla testing and chimpazee testing.
pick the odd one out bend shave chop whittle shear
3, 5, 8, 13, 24, 39, 72 FIND THE WRONG NUMBER
A boy has Rs 3 in total. If he wins, he gains 1 Rupee and if he looses, he has to loose 1 Rupee. The boy may lose only 5 times in the game and if he earns 5 Rs, he has to quit the game. Find the number of ways of the possibilities.
there is number X in decimal represntation whose last digit is not 0. if digits of X are reversed then we obtain new number say Y. both X and Y are divisible by 7. then find all such X from 10 to 1000.
A flight carrying food packets is flying at a height of 1960m from the ground. The speed of the flight is given. Find the time taken for a food packet dropped at that instance to hit the ground.