Q 18 A car can finish a journey in 10 hours at the speed of 48 km/hr. By how much should its speed be increased so that it may take only 8 hours to cover the same distance?
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You have been given the speed s=48 km/hr and the time taken t=10 hrs
using this you can find the distance d=s*t which equals 480 km.
Now that we have the distance, we need to find the new speed the car needs to travel so as to cover 480 km in 8 hrs.
new_speed=480/8=60 km/hr
hence the increase in speed is 60–48=12 km/hr
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