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Start learning 50% faster. Sign in nowLet the speed of the current be x km/hr According to the question, 15/(5 – x) – 20/(5 + x) = 5 Or, x2 + 7x – 30 = 0 Or, x2 + 10x – 3x – 30 = 0 Or, x(x + 10) – 3(x + 10) = 0 Or, (x – 3) = 0 or, (x + 10) = 0 X = -10 km/hr not possible Therefore, x = 3 km/hr Hence, option b.
The speeds of Avinash and Rahul are 70km/hr and 90km/hr. Initially Rahul is at a place P and Avinash is at a place Q. The distance between Rahul and Avi...
Which of the following statements is/are redundant to answer the above questions?
Aman, Sam and Kiran started working together but after 8 days Kiran left the job and 5 days before the completion of the work Sam also left then, In how...
P, Q and R can do piece of work in 48, 60 and 80 days respectively. All three began to work together but P and Q left 12 and 16 days respectively before...
Which of the following equations represents the number of day in which A and C working together can finish the same work?
Aman is how much % (less/more) efficient than Kiran?
What is the amount that Sumit spends annually on paying his loan instalments?
Which of the following equations represents the number of days in which A and B Working together can finish the same work?
A tank is filled by 3 pipes, second pipe take 10 hours more than first pipe and 10 hours less than third pipe to fill the tank alone. If second and thir...
A yearly payment to the servant is Rs 4080 and 1 journey ticket but servant leave the job after 7 months and receives Rs 1580 and 1 journey ticket, then...
