Question

Vidushi drives at 50 km/hr and starts his journey at 4 : 00 a.m. Vidhu drives at 60 km/hr and starts her journey at 5 : 30 a.m. and follows Vidushi. If Vidushi catch Vidhu at $ab:cd$ PM, then $a+b+c+d=?$

Answer 1

Vidushi start at 4:00 AM and drive 50 km/h Distance traveled $s1=50\times t$
Distance traveled by Vidhu $s2=60\times (t-1.5)$
they meet when s2=s1
$60\times (t-1.5)=50\times t$
$60\times t-90=50\times t$
$10t=90$
$t=9h$
they meet 9 hours after Vidushi started $4+9=13$
that is at $1:00pm$