10. Ram complete 30 km of a journey at 6 km/h and the remaining 40 km of the journey in 5 h. Find the average speed for the whole journey. GUERRB NTPC (Phase 1) 2016 (1) 6 km/h (2) 7 km/h (3) 7.2 km/h (4) 8 km/h

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( therefore ) 10. (2) Total distance ( =30+40=70 mathrm{km} ) Total time taken ( =frac{30}{6}+5 ) ( =frac{60}{6}=10 mathrm{h} ) ( therefore ) Required average speed ( =frac{70}{10}=7 mathrm{km} / mathrm{h} )

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