Question

To cover a distance of 315 km in 2.8 hrs, what should be the average speed of the car

Answer 1

$Average \: Speed \: = x \\ \\ A.T.Q \\ x = \frac {315}{2.8} \\ x = 112.5 \: km/h \: or \: 31.25 \ : m/s$

Answer 2

A can do a piece of work in 4days and Bcan complete the same work in 12 days .what is the number of days required to do the same work together?