​​While covering a distance of 35 km, a man noticed that after cycling for 4 hours 15 minutes, the distance covered by him was $$\frac{4}{3}$$​of the remaining distance.

What was his speed (in km/h, rounded off to one decimal place)?

Correct option is D

Given:

Total distance = 35 km

Time cycled = 4 h 15 min = 4.25 h

Distance covered =$$\dfrac{4}{3}$$​ of remaining distance

Formula Used:

Speed $$= \dfrac{\text{distance}}{\text{time}}$$​​

Solution:

Let covered distance = x km

remaining = 35 - x km

Condition: x $$= \dfrac{4}{3}(35 - x)$$

3x = 140 - 4x 

7x = 140

x = 20 km

speed $$=\frac{20}{4.25}\approx4$$​.7 km/h