Rapido, a mobility firm, has secured $120 million in Series E funding from WestBridge Capital and other investors.The funding round values Rapido as a unicorn, with a total valuation of over $1 billion.WestBridge Capital is Rapido's major backer with a 26% stake in the company.Rapido claims to have surpassed Ola and become the second-largest ride-hailing company, behind Uber.