Correct Answer - Option 2 : 30 km/hr
Solution : Let the usual speed be x km/hr .
Due to traffic the speed is 66.66% of x = 2x/3 km/hr
Formula Used :
speed = distance/time
Calculations:
The usual time = 50/x hr
Time taken to complete the journey when there is traffic = 50/(2x/3) = 75/x hr
According to question he is late by 50 minutes = 50/60 hrs
So , 75/x – 50/x = 50/60
⇒ 25/x = 5/6
⇒ x = 30 km/hr