Question

A car moves 20 km with a speed of 30 km/h and next 20 km with a speed of 60 km/h. What is the total time taken in this whole journey?

Answer 1

We know that Speed = Distance/ Time

Hence 30 = 20/T1    and     60 = 20/T2

​T1 = 20/30     and      T2=20/60

T1 = 2/3        and      T2 = 1/3

Total Time = T1 + T2

​2/3 + 1/3  =  3/3

=1

Ans.- Total time take in this whole journey is 1 hour.

Answer 2

HI !

Distance = 20 km
Speed = 30 km/hr
Time = distance/speed = 20/30 hours = 2/3hrs


Distance = 20 km
Speed = 60km/hr
Time = 20/60 hrs = 1/3 hr

Total time = 1+3 + 2/3 = 3/3 = 1 hour