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. A car covers its journey at the speed of 80km/hr in 10hours. If the same distance is to be covered in 4 hours, by how much the speed of car will have to increase?a. 40km/hrb. 60km/hrc. 90km/hrd. 120km/hr

Question

. A car covers its journey at the speed of 80km/hr in 10hours. If the same distance is to be covered in 4 hours, by how much the speed of car will have to increase?a. 40km/hrb. 60km/hrc. 90km/hrd. 120km/hr

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Solution

First, let's find out the total distance covered by the car. We can do this by multiplying the speed of the car by the time taken.

So, Distance = Speed x Time = 80km/hr x 10hrs = 800km

Now, if the car has to cover the same distance in 4 hours, we need to find out the new speed required. We can do this by dividing the total distance by the new time.

So, New Speed = Distance / New Time = 800km / 4hrs = 200km/hr

The car was originally travelling at 80km/hr. So, to find out by how much the speed of the car will have to increase, we subtract the original speed from the new speed.

So, Increase in Speed = New Speed - Original Speed = 200km/hr - 80km/hr = 120km/hr

So, the speed of the car will have to increase by 120km/hr. Therefore, the answer is (d) 120km/hr.

This problem has been solved

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