Question

Nidhi text 3 hour more than Renu to work 30 km but if any double his place she is ahead of Renu by 3 by 2 hours find their speed of walking ​

Answer 1

solution :

• .let speed of A be x km\h
• let speed of B be your km\h
• Distance is 30km

Time taken by A to walk = distance / speed = 30 \ x hrs

Time taken by B to Walk = distance \speed = 30 / you hrs

.....ACCORDING TO THE CONDITION

• 30/x = 30/y + 3

..... Dividing both sides by 3

• 10/x=10/y +1...... (1)

when A double his place, his speed is = 2x km/h

...Time taken to walk A 30km = 30/20x hrs

....ACCORDING TO THE GIVEN CONDITION....

• 30/y=30/20x + 3/2

...Dividing both sides by 3/2

• 20/y+10/x + 1 ..... (2)

¿¿¿put the value 1/x a and 1/y b

,,,,,,,from eq (1) 10a = 10b +1

• 10a - 10b ..... (3)

from eq (2) 20b = 10a+b......

• 10a - 20b = -1.... (4)

,,,,subtracting eq (4)from (3)

• 10a -10b (10a-20b)
• 10a- 10b - 10a + 2ab =2

10b = 2

b = 1/5

...put the value b in )3)

10a - 10b 1/5-1

a= 30/10

1/x = 3/10 or = 10/3

1/y = 1/5 or y = 5

SPEED A = 10/3 KM/H

SPEED B = 5 KM /H..