drraju's problem please solve it

[munimM]

1. Given (1/(x+y)) – 1 + (1/(x-y)) – 1 = 4. Which of the following must be true?
I. x = 2
II. y = 0
III. y = -1
A. Only I
B. Only II
C. Both I and III
& so on

2. .Given a train ‘p’ travelling a distance ‘s’ km at an average speed of r km/hr and another train ‘t’ travels a distance ‘y’ at a speed of z km/hr. Find the equation which satisfies the above problem?

A.sr - yz > 0

B. sz - yr > 0

C. yz – sr > 0

D. ry.sz > 0

E. sy – rz > 0
(Something similar to this)

[Curly213]

To number 1 :
ive got to th point that i would choose so on... because iam stock at this equation and nothin has to be in my opinion....
-2y= 6(x^2-y^2)
i`ll think this excercise makes no sense....


to number 2 ... to munim M ive read it, tried to solve it but didnt come to an solution because ive thought s.th. is missing so i looked after it at dr.raju and u missed one important information to tell
....so this is the complete question
Given a train ‘p’ travelling a distance ‘s’ km at an average speed of x km/hr and another train ‘t’ travels a distance ‘y’ at a speed of z km/hr. If the time taken by train ‘p’ is less than train ‘t’, then find the equation which satisfies the above problem?

For p: T=D/R
Time =Distance/Rate
so...T=S/X


For T
T=y/z

and u have the info that p takes less time then t (train)
so s/x < y/z
s*z < y*x
sz-yx <0
so look at the answer choices and we `ve only a.-choices which are greater than 0
sz-yx<0 times (-1)
yx-sz>0
hence d .... hope its simple to understand!!!

[munimM]

thanks curly213

[priyanka.dahiya]

por favor, El Señor explain no. 1.how to solve it.