Question

In covering a distance of 30 km, Arun takes 2 hours more than Anil. If Arun doubles his speed, then he would take 1 hour less than Anil. What is Arun's speed?

Answer 1

dist=speed*time
so time =x
speed=y
then
1---> (x+2)y=30
2--->(x-1)2y=30

Answer 2

yx=10,y=10,x=1

Answer 3

divide 1 and 2 then solve for x first...

Answer 4

now use x= 3 in any of the equation to get
y =6...

Answer 5

no x=-4

Answer 6

y=-15

Answer 7

check it @matricked

Answer 8

yup my calculation is wrong ...

Answer 9

x=4 dear....

Answer 10

(x+2)=2(x-1) x+2=2x -2 x-2x=-2-2 -x=-4 hence x=4

Answer 11

y= 5

Answer 12

thanks for correcting my calculation...

Answer 13

you are welcome!

Answer 14

plse tell me matrick why i get different answer for this eqn 1
yx+2y=30
2yx-2y=30
so yx=10,y=10 if we substitute in eqn 1and y=5 in eqn 2

Answer 15

if xy =10
then y=10 and x=1 are not the only factors...of 10
and not only that x and y may be integers...

Answer 16

in case if xy =0
then only we can xay either x=0 or y=0 or both..

Answer 17

so by using ur method we are getting the right answer.but if y=5,x=4 this is not equal to 10 it is equal to 20

Answer 18

something went wrong in eqn 1

Answer 19

its really confusing .but i got it by different method