Vivek drove his car first 160 km at 64 km/hr and the next 160 km at 80 km/hr. What is the average speed for the first 320 km of his tour?

75.2 km/hr

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69.8 km/hr

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71.11 km/hr

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76 km/hr

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Solution

The correct option is C
71.11 km/hr

Total time taken = $\frac{160}{64} + \frac{160}{80}$ = $\frac{9}{2}$ hrs

Average speed = $\frac{t o t a l d i s t a c e}{t o t a l t i m e}$

= $\frac{320}{\frac{9}{2}}$

= 71.11 km/hr

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Vivek drove his car first 160 km at 64 km/hr and the next 160 km at 80 km/hr. What is the average speed for the first 320 km of his tour?

The correct option is C 71.11 km/hr Total time taken = 16064+16080 = 92 hrs Average speed = total distacetotal time = 32092 = 71.11 km/hr

The correct option is C
71.11 km/hr

Total time taken = $\frac{160}{64} + \frac{160}{80}$ = $\frac{9}{2}$ hrs

Average speed = $\frac{t o t a l d i s t a c e}{t o t a l t i m e}$

= $\frac{320}{\frac{9}{2}}$

= 71.11 km/hr