To determine the time it takes to cover the same distance when the speed is increased by 10 km/hr, we can use the formula:
Time = Distance / Speed
Given that the initial distance is 600 km and the initial time is 15 hours, we can calculate the initial speed:
Speed = Distance / Time = 600 km / 15 hours = 40 km/hr
Now, let's calculate the new speed:
New Speed = Initial Speed + Increase in Speed = 40 km/hr + 10 km/hr = 50 km/hr
To find the new time, we can use the formula:
New Time = Distance / New Speed = 600 km / 50 km/hr = 12 hours
Therefore, when the speed is increased by 10 km/hr, it takes 12 hours to cover the same distance of 600 km.