Question

A girl completed a trip of 136 km in 4 hours. A part of this trip was covered at 30 km/hr, and the remaining at 36 km/hr. Find the distance covered at 36 km/hr?

Answer 1

Answer:

total trip time = 8 hrs.

total trip distance = 136 km.

Let x distnce covered @ 15 km/h.

y distance covered @ 18 km/h.

So :- x+y = 136 (1).

15

x

+

18

y

=8⇒

90

64+54

=8⇒6x+5y=720 __ (2)

By (1) & (2).

6x+6y=816

6x+5y=720

___________

y=96.

& x=136−96=40

x=40

So :- 40 km by 15km/h & 96 km by 18 km/h