3) A person can complete a journey in 14 hours If he travels the first half of the journey at the rate of 21 km and the and half of the journey at the rate of 24 km/h Then, find the total lenght of the journey in km.
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Explanation:
let the total journey be x
Now we can say Total distance covered = (1/2)x ÷ 21 + (1/2)x ÷ 24 = 14
x/21 + x/24 = 14*2 = 28
LCM of 21 and 24 = 168
(8x + 7x)/168 = 28
15x = 28*168 = 4704
x = 4704/15 = 313.6 km
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