Question #72449

1 Answer
Mar 26, 2017

it would be 32.4 km or 32,400 m

Explanation:

So if the bus moves in straight line with the same speed and no external forces acting on it,

from the formula used in physics d = u * t

[ d <- distance , u<- velocity, t <- time]

you would have d = 40 * ( t + 7 * 60) [1]
and d = 36 * ( t + 22*60) [2]

so you will firstly solve the equation (1) = (2) for t

40 * ( t + 420 ) = 36 * ( t + 1320)
40 * t + 420 * 40 = 36 * t + 1320 * 36
4 * t = 47,520 - 16,800
4 * t = 30,720
t = 7680 seconds or 128 minutes

then choose one equation and replace the time :

d = 40 * ( 7680 + 7 * 60)
d= 40 * ( 7680 + 420)
d = 40 * ( 8,100)
d = 32,400 m or 32.4 km