DU WIT 56. A train travelled distances of 10 km, 20 km and 30 km at speeds of 50 km/hr, (c) 60 km/hr (d) 70 km/hr 60 km/hr and 90 km/hr respectively. The average speed of the train was (a) 60 km/hr (6) 66.67 km/hr (c) 69.23 km/hr (d) 60 km/hr

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( d_{T}= ) Total distance ( 10+20+30 ) ( 60 mathrm{km} ) ( y=sin A=frac{d}{1 t}=frac{60 times 15}{13} )

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