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A man completes a journey in 15 hours. He travels first half of the journey at the rate of 20 km/hr and second half at the rate of 30 km/hr. Find the total distance of the journey in km.
1. 320 km
2. 400 km
3. 300 km
4. 360 km

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Correct Answer - Option 4 : 360 km

GIVEN:

A man completes a journey in 15 hours. He travels first half of the journey at the rate of 20 km/hr and second half at the rate of 30 km/hr.

FORMULA USED:

Speed = Distance/Time

CALCULATION:

Suppose total distance = A km

So,

(A/2)/20 + (A/2)/30 = 15

⇒ A/40 + A/60 = 15

⇒ 5A/120 = 15

⇒ A = 360

Hence, total distance = 360 km

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