Question #72449

1 Answer
El,
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

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