Question

a car travels at a distance of 270 km in 4 whole 1 upon 2 second .Find the speed:​

Answer 1

Answer:

ANSWER

Let the distance travelled at 100 km/hr be x km.

Then, distance travelled at 50 km/hr is (170 - x) km.

Given,

100

x

+

50

(170−x)

=2

⇒

100

x+2(170−x)

=2⇒x+240−2x=200

⇒x=140km.

∴ Distance travelled at 50 km/hr =(170−140)km=30km

Answer 2

Answer:

$distance = 270km = 270000m$

$time = 4\frac{1}{2} \\ \: \: \: \: \: \: \: \: = \frac{9}{2}$

$speed = \frac{distance}{time}$

$speed = \frac{270000}{ \frac{9}{2} }$

$speed = \frac{270000 \times 2}{9}$

$speed = 30000 \times 2$

$speed = 6 \times {10}^{4} m \: per \: sec$