A boy completes a journey in 12 hours Does he travel the first half of the journey at the rate...........

Quantitative Aptitude (CDS) Time & distance

A boy completes a journey in 12 hours. Does he travel the first half of the journey at the rate of 21 km /hr and the second half at the rate 24 km/h .find the total journey in km?

544320 km

434211 km

234121 km

445422 km

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Explanation:

let distance is d km
total time =12 hours
first half time=d/2 21
second half time=d/2 24
d/2×21 +d/2×24 =12
d(21+24)/2×24×21 =12
d=12×2×24×21/45
d=544320 km