Question

a bus cover 160 km at a speed of 80 km per hour and the next 200 km at a speed of 50 km per hour find the average speed of the bus for whole journey​

Answer 1

so on the first journey

$V_1 = \frac{distance}{time}$

$80 = \frac{160}{time}$

$time = \frac{160}{80}$

$time = 2 \: hours$

on the second journey

$V_2 = \frac{distance}{time}$

$50 = \frac{200}{time}$

$time = \frac{200}{50}$

$time = 4 \: hours$

so average speed
$= \frac{total \: distance}{ total \:time \:taken}$

$= \frac{200+160}{4+2}$

$v_{average} = \frac{360}{6}$

$v_{average} = 6ms^-1$