Susan cycles from home to a coffee shop to purchase dinner before continuing the journey to her grandmother's place. Susan cycled at a speed of 4 m/s to the coffee shop for 3 minutes, took another 10 minutes to buy dinner and continued the rest of the journey to her grandmother's house at a speed 6 m/s. Given that the total distance is travelled 4500m,
B) find the average speed for the whole journey in m/s
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