Hint
It doesn't matter what the distance is, so try a random distance.
Answer
This cannot be done.
It does not matter how far the trip is, let's assume that it is random distance, say 60 miles, and remembering that Time = Distance ÷ Speed.
The morning trip took 60 miles ÷ 30 mph = 2 hours.
To average the required 60 mph, we would have to travel the total distance (of 120 miles) in 2 hours. However, we've already used all of the two hours for the morning trip!
Choosing any random distance would also show that it can't be done.
??
Puzzle 7
The infamous BrainBashers encyclopedia has been suffering from its usual problems again.
Below is a printout of reptiles and amphibians, but they have lost every other letter.
Can you replace the missing letters? -r-g-o-t-i-e-n-k--e-t-i-a-d-r-c-d-l--a-a-a-d-r-u-t-e-k-n-a-l-g-t-r
Take a set of three letters from the left column, and a set of three letters from the right column and merge them together, without changing the order of the letters in each half (matching sets might not be currently on the same row).
Example 1: wmb + oat and oat + wmb both equal wombat.
Example 2: rbt + abi and abi + rbt both equal rabbit.
Can you find the six animals that have been split in half?
cyo aru
wls dne
ear fee
oky ote
rrt jar
agu bve
