Question

A car completes a journey in 10 minutes. For the first half of the
distance the speed was 60 km/h and for the second half the speed was 40 km/h
How far is the journey?
Answer is 400m.
​

Answer 1

Step-by-step explanation:

let's half distance is x km

then

total time taken = x/60+x/40

in the question given total time 10 min = 1/6 hour

so,

x/60+x/40= 1/6

=>. 5x/120= 1/6

=>. x = 120/(6×5)= 4 km

then total distance = 8 km is right ans

Answer 2

Answer:

8m

Step-by-step explanation:

let total distance be d

$\frac{ \frac{d}{2} }{60} + \frac{ \frac{d}{2} }{40} = \frac{10}{60} \\ \frac{d}{120} + \frac{d}{80} = \frac{1}{6} \\ \frac{2d + 3d}{240} = \frac{1}{6} \\ \frac{5d}{40} = 1 \\ d = 8$

The answer is not 400m.

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