Question

2.Solve0.6x–1.9= 0.2x+0.5 (b) + = 14 (c) 8−3 = 2
3.Whatshouldbesubtractedfrom 2x2 –y2 +4z2 togetx2 +y2 –z2
4. The perimeter of a rectangle is 16x2 + 10x + 6 and one of its sides is 8x2 + 3x. Find the other side. 5.Convert (a)90km/hrintom/sec (b) 35m/sec.
6. The length of a train is 175m. It is travelling at a63km/hr. How long will it take to crass an electric post? 7. A train 760m long crosses a platform 440m long in 40 seconds. Find the speed of the train in km/hr.

Answer 1

Answer:

7.) speed=distance/time

s=d/t

=440/40

=11m/s

now we should convert m/s into km/h

=11×18/5

=39.6km/h

6.)time=distance/speed

=175/63

=2.77777778hrs

5.)@90km

=90×5/18

=25m/s

b.)35m/s

=35×18/5

=126kmph