Question

a car covers first half distance between 2 places at a speed of 80km/hr and the 2nd half with a speed of 60km/hr what is the average speed of the car?

Answer 1

Answer:

70km/h

Explanation:

first half speed =80

2nd speed =60

average=80+60/2

=140/2=70km/h

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Answer 2

Let the Total Distance be D

$\underline{\bigstar\:\textsf{According to the given Question :}}$

$:\implies\sf Speed_{Avg}=\dfrac{Total\:Distance}{Total \: Time}\\\\\\:\implies\sf Speed_{Avg}=\dfrac{D}{t_1+t_2}\\\\\\:\implies\sf Speed_{Avg}=\dfrac{D}{\frac{D}{2 \times 80}+\frac{D}{2 \times 60}}\\\\\\:\implies\sf Speed_{Avg}=\dfrac{D}{\frac{D}{160}+\frac{D}{120}}\\\\\\:\implies\sf Speed_{Avg}=\dfrac{x}{\frac{30x+40x}{4800}}\\\\\\:\implies\sf Speed_{Avg}=\dfrac{4800x}{70x}\\\\\\:\implies\underline{\boxed{\sf Speed_{Avg}=68.57\: km/h}}$

⠀

$\therefore\:\underline{\textsf{Average Speed of car is \textbf{68.57 km/h}}}.$