Answer:
Speed required to cover second half of distance = 30 km/hr
Step-by-step explanation:
Total distance Steve traveled = 40 km
He covers the first half of the distance averaging a speed of 15 km/hr.
So he covers 20 km at a speed of 15 km/hr.
[tex]\texttt{Time taken to cover first half = }\frac{20}{15}=1.33 hours[/tex]
We need to find in order to average 20 km/hr for the entire trip , how many kilometers per hour must his average speed be during the second half of the trip.
[tex]\texttt{Total time taken = }\frac{40}{25}=2 hours[/tex]
So he need to cover second half distance in (2 - 1.33) hours = 0.67 hours.
[tex]\texttt{Speed required = }\frac{20}{0.67}=30 km/hr[/tex]
Speed required to cover second half of distance = 30 km/hr
