Question 533738
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D=RT

In the first case we can find the distance.  R = 240 km/hr and T = 5 hr.

D = 240 km/hr * 5hr = 1200 km

Now we know the distance, which is the same distance as in the second case.  D = 1200 km, T = 1.67 hr  we can find the necessary rate.  

First let's convert 1 and 2/3 into an improper fraction.  To do that multiply 3 * 1 and add 2 to find the numerator.  The denominator remains 3.  So it's 5/3.

1200 km = R * 5/3hr  Divide both sides by 5/3 to isolate R

1200km / 5/3 hr = R = remember that dividing by a fraction is the same as multiplying by the reciprocal of the fraction.

1200km * 3/5 (1/hr) = 3600/5 km/hr = R = 720 km/hr