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dolly, molly and polly each can walk at 6\:km/h6km/h. their one motorcycle, which travels at 90\:km/h,90km/h, can accommodate at most two of them at once (and cannot drive by itself!). let tt hours be the time taken for all three of them to reach a point 135\:km135km away. ignoring the time required to start, stop or change directions, what is true about the smallest possible value of tt?
Sagot :
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