Mathematics
Assertion (A): A moving boat goes downstream at 50 km per hour and upstream at 30 km per hour. The speed of stream is 40 km per hour.
Reason (R): If the speed of boat in still water is x km per hour and speed of stream is y km per hour, then y - x = 50 and y + x = 30 ⇒ y = 40.
- A is true, R is false.
- A is false, R is true.
- Both A and R are true.
- Both A and R are false.
Related Questions
Assertion (A): 1133 + 153 is divisible by 98.
Reason (R): Factors of a3 + b3 are (a + b) and (a2 - ab + b2).
- A is true, R is false.
- A is false, R is true.
- Both A and R are true.
- Both A and R are false.
Assertion (A): 3x2 - 8x - 15 is not factorisable.
Reason (R): The trinomial ax2 + bx + c is factorisable, if the value of b2 - 4ac, where a = coefficient of x2, b = coefficient of x, c = constant, is perfect square, otherwise not.
- A is true, R is false.
- A is false, R is true.
- Both A and R are true.
- Both A and R are false.