Question

a body travels a distance of 10 km with a constant speed of 30 km per hour and then the next 40 km at a constant speed of 50 km per hour find the average speed for the whole journey​

Answer 1

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Answer 2

Answer:

D1=10 km.

$T1=10/30=1/3hr.$

D2=40km.

$T2 = \frac{40}{50} = \frac{4}{5}$

$average \: speed \: = \frac{d1 + d2}{t1 + t2}$

$= \frac{10 + 50}{ \frac{1}{3} + \frac{4}{5} }$

$= 45.4 \: km \hr$