One-fourth of certain journey is covered at the rate of 25 km/h, one-third at the rate of 30 km/h and the rest at 50 km/h. Find the average speed for the whole journey.

• ক 600/53km/hr
• খ None of these
• গ 1200/53 km/hr
• ঘ 1800/53km/hr ✅ সঠিক উত্তর