A man on tour travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. The average speed for the first 320 km of the tour is:
35.55 km/hr
36 km/hr
71.11 km/hr
71 km/hr
Explanation:
Total time taken =$\left( \dfrac{160}{64}+\dfrac{160}{80} \right)hrs.=\dfrac{9}{2}hrs.$
$\therefore$ Average speed =$\left(320 \times \dfrac{2}{9}\right)km/hr$
= 71.11 km/hr.
Total time taken =$\left( \dfrac{160}{64}+\dfrac{160}{80} \right)hrs.=\dfrac{9}{2}hrs.$
$\therefore$ Average speed =$\left(320 \times \dfrac{2}{9}\right)km/hr$
= 71.11 km/hr.