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Let speed of train B be ‘x’ km/hr. According to question, => 30(45 + x) × (5/18) = 550 => 1350 + 30x = 1980 => 30x = 630 => x = 21 km/hr
Rishu saves x% of her income. If her income increases by 26% and the expenditure increases by 20%, then her savings increase by 50%. What is the value of x