a man covered 1/3rd of it’s journey with 30km/br 2nd 1/3 with 40 km/hr and rest with a speed of 50 km/hr .find his average speed.

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# A man covered 1/3rd of it’s journey with 30km/br 2nd 1/3 with 40 km/hr and rest with a speed of

a man covered 1/3rd of it’s journey with 30km/br 2nd 1/3 with 40 km/hr and rest with a speed of 50 km/hr .find his average speed.