Question

please solve the above two questions​

Answer 1

Answer:

29:-

Let the speed of car from A is = X

then car from B = X-8

let distance of car which starts from A after 4 hours to point B is = Y

and distance of car which starts from B to point A after 4 hrs = Z

then Y+Z+62= 350

Y+z = 288km

Distance covered by B after 4 hrs= Z+62

distance covered by A after 4 hrs = 350-Z

speed of car from A , X= (350-Z)/4 __(1

speed of car from B , X-8 = (Z+62)/4 ___(2

put value of X from 1 in eqn 2

(350-Z)/4 - 8 = (Z+62)/4

350-Z-32 = Z+62

Z = 256/2 = 128 km

and X = (350-128)/4 = 55.5 km/hr

Speed of car from B = 55.5 - 8 =47.5 km/hr....

30:-

Given that eight members spent Rs. 12 each.

Let the average expenditure of all the nine be

x

ˉ

Given that ninth member spent Rs. 8 more than the

x

ˉ

Therefore, the amount spent by the ninth member is

x

ˉ

+8

Hence,

x

ˉ

=

9

(12×8)+

x

ˉ

+8

⟹9

x

ˉ

=96+

x

ˉ

+8

⟹8

x

ˉ

=104

⟹

x

ˉ

=13

Total money spent by them is (12×8)+13+8=117

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