CREATE TABLE table_38453 ("Line" TEXT, "Speed" TEXT, "Length" TEXT, "Construction begun" TEXT, "Expected start of revenue services" FLOAT)

What is the Speed when Construction begun in 2010, and an Expected start of revenue services of 2015?
SELECT "Speed" FROM table_38453 WHERE "Construction begun" = '2010' AND "Expected start of revenue services" = '2015'
SELECT "Speed" FROM "table_38453" WHERE "Construction begun" = '2010' AND "Expected start of revenue services" = '2015'