Moshiur can mow a lawn in m hours. Caroline, Moshiur’s younger sister, can mow the same lawn in c hours. (i) Determine how long it takes for the two siblings to mow the lawn together. Use the formula (ii) How long does it take for Moshiur to mow the lawn himself, if the total time it takes for the lawn is 1.5 hours and Caroline takes four hours longer than Moshiur

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