A student goes to school at a speed of 5km/h and returns at a speed of 4 km/h. If he takes 4 hours for his entire journey, then the total distance covered by the student (in km) is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 22.
A student goes to school at a speed of 5km/h = 11/2 km/h and returns at a speed of 4 km/h.
Let's assume the Distance is D.
According to the question,
D/(11/2) + (D/4) = 19/4
⇒ 2D/11 + D/4 = 19/4
⇒ (8D + 11D)/44 = 19/4
⇒ (19D)/44 = 19/4
D = 11
Total distance covered by him = 2D = 22 km