Meaning of meaning-of-うま in Japanese

「時間通りに、自分の教室に旨く行き着くことができる」と彼は考えた。
"I can make it to my class on time," he thought.

あそこの食べ物はうまいし値段も安いが、地の利が悪いのが難点だね。
That place's food is great and their prices are good but the fly in the ointment is their terrible location.

それはあまりにもうますぎる話だ。
That's too good a story to be true.

この川はあの川の３倍長い。
This river is three times longer than that one.

信濃川と阿賀野川ではどちらが長いですか。
Which is longer, the Shinano River or the Agano River?