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Start learning 50% faster. Sign in nowLet the speed of stream be ‘x’ km/h and they meet after‘t’ hours According to question, Distance covered while going upstream + Distance covered while going downstream = Total distance covered. (30 - x)t + (25 + x)t = 660 30t + 25t = 660 55t = 660 t = 12 hours
I. 2x 2 + 5x + 2 = 0
II. 4 y 2 = 1
In how many ways can the selection of 4 boys and 3 girls can be made from a group of 6 boys and 6 girls?
I. x2 = 100
II. y2 - 9y + 20 = 0
...I. 3x2 - 14x + 15 = 0
II. 15 y 2 - 34 y + 15 = 0
If the S.P. of Rs 2250 results in a 10% discount on list price, what S.P. would result in a 20% discount on list price?
...If 94*6714 is divisible by 11, where * is a digit, then * is equal to
