Question

he covers one-fourth of the total distance at 20 km/hr, one-fourth at 10 km/h

and rest of his journey at 80 km/h. Find his average speed for the whole distance?​

Answer 1

Answer:

The common factors of 20 and 80 are 20, 10, 5, 4, 2, 1, intersecting the two sets above. In the intersection factors of 20 ∩ factors of 80 the greatest element is 20. Therefore, the greatest common factor of 20 and 80 is 20.Please follow me....