Subject: mathqa
Question: a bullock cart has to cover a distance of 80 km in 10 hrs . if it covers half of the journey in 3 / 5 th time . what should be its speed to cover the remaining distance in the time left .
Option: 
A: 30 kmph
B: 20 kmph
C: 50 kmph
D: 10 kmph
Answer: D