A car completes a journey in 7 hours. One third of the journey was performed at 20 km/hr and the rest at 30 km/hr. Find the total length of the journey. (The answer is 180 km, I want the correct working)
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journey was performed at 20 km/hr and the rest at 30 km/hr. Find the total length of the journey. (The answer is 180 km, I want the correct working)
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