Question

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Answer 1

Answer:

54 seconds

Explanation:

Given

Length of fly over = 500m

Length of school bus = 250m

Hence total distance = 500 + 250 = 750m

Speed  = 50km/hr = 50 x $\frac{5}{18} m/s$   (1 km/hr =  $\frac{5}{18} m/s$ )

We know,

$Speed = \frac{Distance}{Time}$ ⇒ $Time = \frac{Distance}{Speed}$

Time = $\frac{750}{\frac{50 X 5}{18\\} }$ = $\frac{750 X 18}{50 X 5}$ = $\frac{750 X 18}{250} = 3 X 18$ = 54 s

Answer 2

Total length = 500+10=510

Speed = 30 m/s

Time = 510/30 = 17 seconds

Hope it's helpful

have a nice day ahead ^_^