Anybody know the answer to this one?

Yardım edin lütfen uzun cevap lazım çok puan veriyorum

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

Aclarinetist, setting out for a performance, grabs his 3.350 kg clarinet case (including the clarinet) from the top of the piano and carries it through the air with an upward force of 24.65 n. find the case's vertical acceleration. indicate an upward acceleration as positive and a downward one as negative.