A teacher travelled a distance of 22 km in 7 hours. He travelled partly on foot at the speed of 2 km/h and partly on a bicycle at the rate of 4 km/h. The distance travelled on foot is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 6 km.
Let distance travelled on foot = x km
Distance travelled by bicycle = 22 - x km
Time on foot = hours
Time on bicycle = hours
According to the question,
⇒ + = 7
⇒ 2x + 22 - x = 28
⇒ x = 6