Answer:
12km
Step-by-step explanation:
Given that:
Let:
Total distance = d
From start to giant oak tree = 60% of hike
Distance from start to giant oak tree = 18 km
Hence ;
60% of d = 18km
0.6d = 18km
Divide both sides by 0.6
0.6d/ 0.6 = 18km / 0.6
d = 30km
Total distance of picnic area = 30 kilometers
Hence, distance left to reach picnic area :
Total distance - distance covered
30km - 18km
= 12km