A man covers a certain distance at the speed of x km/h and returns to the starting point at 56 km/h. If his average speed for the whole journey is 63 km/h, then what is the value of x?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 72.
Average speed =
⇒ 63 =
⇒ 9 =
⇒ 9x + 504 = 16x
⇒ 7x = 504
⇒ x = 72