Question

A car covers a certain distance in 50 mins if it runs at 45 km/hr.how much time will it take to cover the same distance at 30 km/hr

Answer 1

t1=50min
=50×60
=3000sec
speed1=45km/hr
=45 ×1000/3600 ( we have to convert km into m and hr into sec)
=25/2m/sec
distance=speed×time1
=25/2×3000
=37500m

Now,
distance=37500m
t2=?
speed=30km/hr
=30×1000/3600
=25/3m/s
A.T.Q
distance=speed×time2
37500=25/3×time2
3×37500/25=time2
4500sec=time2