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Uber's business continues to grow, but so do its losses.

The firm lost $1.1bn (£851m) in the last three months of 2019, even as revenue jumped 37% to $4bn and the number of trips made on its platform rose by 28%.

Spending to expand its Uber Eats food delivery business hurt the firm's bottom line.

Uber boss Dara Khosrowshahi said he was "gratified" with the progress the firm is making toward profitability.

Adjusted for items such as taxes, the core "ride" part of the business turned a profit in the last three months of last year.

'Well-positioned to win'

"We recognize that the era of growth at all costs is over," Mr Khosrowshahi said.

"In a world where investors increasingly demand not just growth, but profitable growth, we are well-positioned to win".

Mr Khosrowshahi said the firm expects investment in Uber Eats to decline after March, as the firm focuses on markets where it can be the number one or number two "player".

Last month, Uber sold its money-losing India-based food business to competitor Zomato, in exchange for a stake in the start-up.

Media playback is unsupported on your device Media caption A BBC News team previously set up a fake takeaway restaurant on Uber Eats and sold burgers

Shares gained about 4% in after-hours trade, as investors welcomed the firm's pledge to hit its profit targets in 2020, which is sooner than was previously expected.

Since the firm debuted on the New York Stock Exchange last year, shares have been under a cloud, as investors eye the firm's losses and it faces regulatory hurdles around the world. London stripped it of its licence to operate in November after concerns over safety failures.

Dan Ives, analyst at Wedbush Securities, said the firm had delivered a solid quarter for the company that should help build investor confidence in the firm.

"Rome was not built in a day and neither will the Uber growth story," he said.

However the firm will have to do more to turn around its business, said Alyssa Altman, transportation lead at digital consultancy Publicis Sapient.

Uber lost more than $8bn last year in total, even as the number of trips taken on its platform climbed by 32% to nearly 7 million and revenue rose 26% to $14.1bn from 2018.

"Uber's latest attempts to shed money-losing businesses, while promising, don't guarantee it will dig itself out of the financial grave it dug for itself," Ms Altman said.

Uber said there were more than 111 million customers active on the platform in the last three months of 2019, up 22% from the same period in 2018.