Question

A car travels a distance of 170 km in 2 hours partly at speed of 100 kmph and partly at speed of 50 kmph. the distance travelled at speed of 50 kmps is

Answer 1

50km is the distance traveled

Answer 2

Answer: The distance traveled at speed of 50 km/h is 30 km

Explanation:

Given that,

Total distance D = 170 km

Time t = 2 hour

Partly speed = 100 km/h

Partly speed = 50 km/h

Let us considered x distance covered by speed of 50 km/h and 170-x distance covered by speed 100 km/h

So, the time for x distance

$t_{x} = \dfrac{x km}{50km/h}$

The time for 170-x distance

$t_{170-x}= \dfrac{(170-x)km}{100k/h}$

Now, the total time

$t = t_{x}+t_{170-x}$

$2 = \dfrac{x}{50}+\dfrac{170-x}{100}$

$2x+170-x=2$

$x = 30 km$

Hence, the distance traveled at speed of 50 km/h is 30 km.