Hint: use
time ~/zcash/src/zcash-cli zcbenchmark solveequihash 10
to run your benchmark so that you do not need to calculate the average time manually. The result will be something like
real 1m15.879s
user 0m0.000s
sys 0m0.004s
where the first number is the real time taken. Divide 10 by this value (converted into seconds) and you have your hashrate in hashes per second. Of course the advantage to this method is that you can easily run 100 or 1000 loops to average out the run times.