- 50 kmr per hr.
- 48 kmr per hr.
- 54 kmr per hr.
- 40 kmr per hr.

Option 2 : 48 kmr per hr.

**Given**

Ramesh speed Jaipur to Bikaner = 60 km per hr

Ramesh returning speed is = 40 km per hr

**Average speed**

Let the speed between Jaipur and Bikaner be D Km.

Then time is taken to D km. form Jaipur to Bikaner = D/60 hrs.

Time is taken to cover D km from Bikaner to Jaipur at 40 km per hr. = D/40 hrs.

**Calculation**

**∴ **Total distance covered 2D km. = D/60 + D/40= 5D/120 hrs.

**∴ **Average Time = D/60 + D/40

⇒ (2D+3D)/120

⇒ 5D/120 hrs

Total distance both sides is = D + D

⇒ 2D

**∴** Average Speed = (2D)/5D/120

⇒ (2D × 120)/5D

**⇒ 48 km per hr**

Here, A = 60 km per hr.

B = 40km per hr.

**∴ **Average speed = \(\frac{{2ab}}{{a + b}}\)=\(\frac{{2 × 60 × 40}}{{60 + 40}}\)

= \(\frac{{4800}}{{100}}\)= 48 km per hr.

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