Question

Sachin can cover a distance in 1 hr 24min by covering 2/3 of the distance at 4 km/h and the rest at 5 km/h. The total distance is (a) 5 km/h (b) 6 km/h (c) 7 km/h (d) 8 km/h​

Answer 1

we know that,

Time = $\dfrac{Distance}{Speed}$

Let the total distance travelled be D in $\dfrac{84}{60}$ km

Distance travelled in 4 km/hr =$\dfrac{2}{3}$

Distance travelled in 5 km/hr =$\dfrac{1}{3}$

So,

$\dfrac{2D}{3×4}$ + $\dfrac{D}{3×5}$

= $\dfrac{84}{60}$

D = 6 km/h

So, Option (B) 6 km/h is correct