Question

A man completes a journey in 9 hours. He travels first half of the journey at the rate of
20km/hr and second half at the rate of 10 km/hr. Find the total journey in km.
(A) 100 Km
(B) 120 Km
(C) 140 Km
(D)250 Km​

Answer 1

Answer:

120 Km

Step-by-step explanation:

(1/2)x/20 + (1/2)x/10 = 9

x/20 + x/10 = 9*2 (by taking half comman and by transposing it to other side)

(x+2x)/20 = 18

3x/20 = 18

3x = 20*18

x = 20*18 / 3

x = 120

the total journey is 120 Km

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