If i travelled 60 km in 45 minutes,what would my speed in km/h be

If you are driving at 60 km/h, that means you will cover 60 km in 1 hour. But if you cover that same distance in 45 minutes, which is =45 / 60 =3 /4 of an hour, then your speed will be:

60 / (3/4) = 60 x 4/3 =240 / 3 = 80 km/h - which is the answer.