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Time and Distance - General Aptitude

Q1:

A man complete a journey in 10 hours. He travels first half of the journey at the rate of 21 km/hr and second half at the rate of 24 km/hr. Find the total journey in km.

A 220 km

B 224 km

C 230 km

D 234 km

ANS:B - 224 km

(1/2)x + (1/2)x = 10
21 24
x + x = 20
21 24
 15x = 168 x 20
 x = 168 x 20 = 224 km.
15