Data Sufficiency一道题？

summersmiles

31. Who types at a faster rate, John or Bob?

1. The difference between their typing rates is 10 words per minute.

2. Bob types at a constant rate of 80 words per minute.

答案选E,我选的B. 像2这种说法，可以判断出两人速度一样的不行么？

sweetcorns

要有确定且唯一的答案才可以

选B 还是不知道Bob or John 谁快