Learn Russian: Наше производство растёт, и темп работы стал в два раза выше. - Our production is growing, and the pace of work became twice as high.

To say something is "X times more" or "X times less", Russian uses the preposition в + the number in the accusative case + раз (time/times) + a comparative adjective. Here, the number два is accusative and takes the genitive singular раза. Paired with the comparative выше (higher), it literally means "higher by two times."

Would it be wrong to say в два раза высокий?

Yes, it would be incorrect. The multiplicative construction (в + number + раз) always requires the comparative form of the adjective or adverb. You must use выше (higher), not the basic dictionary form высокий (high), to express the comparison.

Why are we mixing the present tense растёт and the past tense стал?

The sentence describes two different states. Растёт is an imperfective verb in the present tense, meaning the production is currently, ongoingly growing. Стал, meaning "became", is perfective and in the past tense, indicating that the shift to a faster pace of work is an already completed result.

Why is the word работы used here instead of just работа?