Question

) Prove that the points A(0, -1), B(-2, 3), C(6, 7) and D(8, 3) are the vertices of a
rectangle ABCD

Answer 1

Answer:

Let x be the speed and t be the original timing ,then distance between Lucknow and Delhi

$Distance =speed \times time =xy$

Now from first observation

$xy=(x-10)(y+3)$ => $3x-10y-30=0$

From second observation

$xy=(x+10)(y-2)$ => $2x-10y+20=0$

Solving both we get

x=50km/hr

y=12hours

So distance between Lucknow and Delhi=$50 \times 12=600$ Km

Answer 2

Answer:

This is answer. Example