Question
A car travels 120 km at a speed of 40 km/h and then 180
km at a speed of 60 km/h. Find the total time taken and the average speed for the whole journey.Solution
Time for first part = 120 / 40 = 3 hours Time for second part = 180 / 60 = 3 hours Total time = 3 + 3 = 6 hours Total distance = 120 + 180 = 300 km Average speed = Total distance / Total time = 300 / 6 = 50 km/h Answer: Total time = 6 hours, Average speed = 50 km/h
The graphs of the equations 3x-20y-2=0 and 11x-5y +61=0 intersect at P(a,b). What is the value of (a² + b² − ab)/(a² − b²...
If, 4x2 + y2 + 12x + 6y + 18 = 0, then find the value of (2x + y)/(y + 6x).
If 70% of ‘y’ is 25% more than 30% of 140, then value of ‘y’ is:
Simplify:
5x + 7y - [(10x + 4y) - (3x + 2y) + 5y] - 3xWhat is the value of (a² + b²+4c²- ab-2bc-2ca) (a + b+2c):
‘a’ is directly proportional to ‘b’. If at a=30, the value of ‘b’ is 20% greater than ‘a’, then find the value of ‘a’ when b=54.
...Let {x + (1/x)} = 4, then Determine the value of {x² + (1/x²)}
If x + 1/x = 5 then find out the value of x⁵ + 1/(x⁵)?
Find the value x2 + y2, if xy = 13 and x + y = 7.
In a triangle ABC, a point D lies on AB and points E and F lie on BC such that DF is parallel to AC and DE is parallel to AF. If BE = 4 cm. EF = 6cm. th...
Relevant for Exams:
