Question

A person covers a distance in 40 min. if he runs at a speed of 45 km/hr on an average. Find the speed at which
he must run to reduce the time of journey to Somin.​

Answer 1

$\huge \boxed{ \fcolorbox{cyan}{red}{Answer : }}$

$\sf{Time = 40/60 hr}$

$\sf{ \frac{2}{3}} \: hr$

$\sf{Speed = 45 kmph}$

$\rm{distance = \frac{speed}{time}}$

$\sf{45 \times \frac{2}{3}}$

$\sf{30 \: km}$

$\rm{Time \: of \: journey = 30m}$

$\sf{ = \frac{30}{60}}$

$\sf{ = \frac{1}{2} \: hr}$

$\rm \red{Speed = Distance/Time}$

$\sf{30 \times \frac{1}{2}}$

$\sf{= 15kmph}$