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8_murik_8 [283]
3 years ago
12

You drive 4 km at 30 km/h and then another 4 km at 50 km/h. What is your average speed for the whole 8-km trip?

Physics
1 answer:
Setler79 [48]3 years ago
6 0

Answer:

option A

Explanation:

given,

drive 4 km at 30 km/h and

another 4 km at 50 km/h

average speed for the whole 8 Km trip = ?

time for the trip of first 4 km

 distance = speed x time

t_1 = \dfrac{d}{s}

t_1 = \dfrac{4}{30}

     t₁= 0.1333 hr

time from another 4 km trip

t_2 = \dfrac{d}{s}

t_2= \dfrac{4}{50}

     t₂ = 0.08 hr

average speed

     s= \dfrac{d}{t}  

     s= \dfrac{8}{0.1333 + 0.08}  

     s= \dfrac{8}{0.2133}  

            s = 37.50 Km/hr

Less than 40 Km/h

the correct answer is option A

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