A tank measures 20m in length, 5m in breadth and it is 25m tall, what is the total surface of the tank

140m sq.

Step-by-step explanation:

The tank is a cuboid open at the top.

Surface area of a cuboid = 2(lb + bh + hl)

Surface area of a tank open at top = Surface area of cuboid - Area of the portion open at the top i.e.

2(lb + bh + hl) - lb = 2 (10*5 + 5*3 + 3*10) - 10*5

2(50+15+30) - 50 = 2*95 - 50 = 190 -50 = 140m sq.

since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m

mk./km: lm

step-by-step explanation:

,mlmlm

; mk

lk