There is a 50m long army platoon marching ahead. The last
person in the platoon wants to give a letter to the first
person leading the platoon. So while the platoon is
marching he runs ahead, reaches the first person and hands
over the letter to him and without stopping he runs and
comes back to his original position.
In the mean time the whole platoon has moved ahead by 50m.
The question is how much distance did the last person cover
in that time. Assuming that he ran the whole distance with
uniform speed.
- 4 Answers
- 22153 Views
- Infosys, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / guest
The last person covered 120.71 meters.
It is given that the platoon and the last person moved with
uniform speed. Also, they both moved for the identical
amount of time. Hence, the ratio of the distance they
covered - while person moving forward and backword - are
equal.
Let's assume that when the last person reached the first
person, the platoon moved X meters forward.
Thus, while moving forward the last person moved (50+X)
meters whereas the platoon moved X meters.
Similarly, while moving back the last person moved [50-(50-
X)] X meters whereas the platoon moved (50-X) meters.
Now, as the ratios are equal,
(50+X)/X = X/(50-X)
(50+X)*(50-X) = X*X
Solving, X=35.355 meters
Thus, total distance covered by the last person
= (50+X) + X
= 2*X + 50
= 2*(35.355) + 50
= 120.71 meters
Note that at first glance, one might think that the total
distance covered by the last person is 100 meters, as he
ran the total lenght of the platoon (50 meters) twice.
TRUE, but that's the relative distance covered by the last
person i.e. assuming that the platoon is stationary.
| Is This Answer Correct ? | 74 Yes | 15 No |
Answer / shubhendu
150
Since the platoon has covered 50m overall and they are moving with uniform speed, we can say it covers 25m when the man comes from last to first(forward) and another 25m when he comes last again(backward).
50m (platoon length)+25+50(platoon length)+25=150m
| Is This Answer Correct ? | 4 Yes | 15 No |
Answer / bipin
50 m
since the entire platoon covered 50 m,the last person also
covers the same distance..:)
| Is This Answer Correct ? | 4 Yes | 45 No |
what is the difference in the functions of wave trap and lightning arrestor
any body who got interview call letter from axis bank... ganesh here... call me 9842648112 or mail me at ganesh_280574@rediffmail.com
There are 8 balls that look identical. One of them weighs less than the others. Given a weighing scale, how will you find this ball.
21 Answers Google, Infosys, Mind Tree, Sapient, Vatika, Wipro,
Plz send me the solved sample question papers of state bank of india
3 machines can complete the work in 4,5, and 6 hours respectively. due to power failures they did the work alternatively. Then what is time taken to complete the work?
In 80 coins one coin is counterfeit what is minimum number of weighings to find out counterfeit coin
Work can be done by 8 men and 10 women in 25 days, the same work can be done by 10 children and 5 women . in how many days 2 children and 3 men can do the work?
Circumference of circle?
the sides of a right angle triangle are a & b and the hypoteneous is c.a perpenticular from the vertex divids c in to two segments r & s adjesent respectible to a & b .if a:b=1:3 then what is r:s=?
my ouestion is current affairs
A train travels a certain distance taking 7 hrs in forward journey, during the return journey increased speed 12km/hr takes the times 5 hrs.What is the distance traveled
Replace each letter by a digit. Each letter must be represented by the same digit and no beginning letter of a word can be 0. O N E O N E O N E O N E ------- T E N
English 
