Steve goes on a 40-km bike ride. He covers the first half of the distance averaging a speed of 15 km/hr. In order to average 20
2 answers:
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.
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.
So he need to cover second half distance in (2 - 1.33) hours = 0.67 hours.
Speed required to cover second half of distance = 30 km/hr
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Answer:
2598 units²
Step-by-step explanation:
Sum the parts of the parts of the ratio 3 + 5 + 7 = 15 parts
Divide the perimeter by 15
300 ÷ 15 = 20 ← value if 1 part, thus sides of triangle are
3 × 20 = 60
5 × 20 = 100
7 × 20 = 140
Using Hero's formula to calculate the area
A =
where s is the semi perimeter and a, b , c are the sides of the triangle
s = 300 ÷ 2 = 150
let a = 60, b = 100 and c = 140, then
A =
=
= ≈ 2598 units²