A, B and C are on a trip by a car. A drives during the first hour at an average speed of 50 km/hr. B drives during the next 2 hours at an average speed of 48 km/hr. C drives for the next 3 hours at an average speed of 52 km/hr. They reached their destination after exactly 6 hours. Their mean speed was : (A, B ও C তিনজন কার ট্রিপে বের হয় । A প্রথম ঘন্টায় 50 km/hr বেগে, এরপর B দুই ঘন্টা ধরে 48 km/hr বেগে এবং শেষে C তিন ঘন্টা ধরে 52 km/hr বেগে চালায় । 6 ঘন্টায় তারা তাদের গন্তব্যে পৌছে । তাদের গড় গতি কত ছিল?)

Related Topics

• Unitary Method
• Age
• Permutation & Combination
• Calendar
• Boat and Stream
• Profit & Loss
• Triangle
• Series
• Pipes & Cistern
• Inequality
• Miscellaneous
• Power & Logarithm
• Data Sufficiency
• Percentage
• Simplification
• Time and Work
• Average
• Quadrilateral
• General Formula
• Speed & Distance