Question

Man on tour travels first 160 km at 64 km per hour and the next 160 km at 80 km per hour the average speed for the first 320 km of the tour is

Answer 1

The average speed for the first 320 km of the tour is 71.11 km/hr.

Answer 2

Answer:

$time \: taken \: to \: cover \: first \: 160 \: km = \frac{160}{64}hr = \frac{5}{2}hr \\ time \: taken \: to \: cover \: next \: 160 \: km = \: \frac{160}{80}hr = 2hr \\ total \: time \: to \: cover \: (160 \: km + 160 \: km = 320 \: km) = \frac{5}{2} hr + 2hr = \frac{9}{2}hr \\average \: speed \: for \: the \: fist \: 320 \: km \: = \frac{distanc}{time} = \frac{320}{92/2} \: km/hr = 71 \times \frac{1}{9} km/hr$