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                                    98. A student while going ti school bus observe the average speed of the bus to be 20km/h.Onhis return trip along the same way ,the average speed is 30km/h. Whatis the average speed of the bus in the entire journey | 
                            
| Answer» 98. A student while going ti school bus observe the average speed of the bus to be 20km/h.Onhis return trip along the same way ,the average speed is 30km/h. Whatis the average speed of the bus in the entire journey | |