Question

Two men P and Q start from a place walking at 5 km per hour and 6.5 km per hour respectively. What is the time they will take to be 92 km apart if they walk in opposite directions?

• A. 2 hr
• B. 4 hr
• C. 6 hr
• D. 8 hr

Answer 1

Answer:

D. 8 hr

Solution:

Given:

Speed of P (s₁) = 5 km/hr

Speed of Q (s₂) = 6.5 m/hr

Distance = 92 km

Concept used:

If two persons walked in the opposite direction,

Relative speed = (s₁ + s₂)

$Times =\frac{Distance}{Speed}$

Calculation:

According to the above concept,

The relative speed of the two men = (5 + 6.5) = 11.5 km/hr

Now, according to the question

$Times =\frac{Distance}{Speed}$

$\frac{92}{11.45}=8 hr$

The required time is 8 hr.