Answer: 20 hours
Explanation:
Hi, to answer this question we have to divide the distance (240km) by the speed rate (12 km/h) applying the next formula:
Time = distance / speed rate
Mathematically speaking and replacing with the values given:
Time = 240 / 12 = 20 hours
In conclusion, it takes 20 hours to travel 240 km at a constant speed of 12 km/h