Question

A boy took 4 whole 1/2 hour to complete 42 km marathon.What was his average running speed

please tell me the answer ☺️​

Answer 1

Answer:

Total distance covered=42km

Total time taken=4whole 1/2 hrs = 9/2 hrs

We know,

Average speed = Total Distance / Total time taken

Therefore,

Average speed=42/(9/2)=42 x 2/9 (reciprocal)

=84/9

= 9 whole3/9(ans)

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Answer 2

Answer:

$distance = 42km \\ time \: taken = 4 \frac{1}{2} = \frac{9}{2} \\ speed = \frac{distance}{time} \\ = \frac{42}{ \frac{9}{2} } \\ = \frac{42 \times 2}{9} \\ = \frac{84}{9} \\ = 9 \frac{3}{9} \\ = 9 \frac{1}{3}$

c.) 9+1/3 km/hr

Step-by-step explanation:

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