The speed of a car is given as 80 km/hr. Select the correct conversion factors.
A car takes 2 hours to reach a destination by travelling at 60 km / hr. How long will it take while travelling at 80 km / hr ?
(a) 1 hr 30 min (b) 1 hr 40 min
(c) 2 hrs 40 min (d) none of these