CREATE TABLE table_203_247 (id DECIMAL, "district" TEXT, "counties represented" TEXT, "delegate" TEXT, "party" TEXT, "first elected" DECIMAL, "committee" TEXT)

how much later as wendell beitzel elected than john donoghue ?
SELECT (SELECT "first elected" FROM table_203_247 WHERE "delegate" = 'wendell r. beitzel') - (SELECT "first elected" FROM table_203_247 WHERE "delegate" = 'john p. donoghue')
SELECT (SELECT "first elected" FROM "table_203_247" WHERE "delegate" = 'wendell r. beitzel') - (SELECT "first elected" FROM "table_203_247" WHERE "delegate" = 'john p. donoghue')