Question
A man rows upstream 10 km and downstream 15 km
taking 5 hours each. Find the man’s speed in still water.Solution
Distance upstream = 10 km, time taken to row upstream = 5 hrs. Speed upstream = 10/5 = 2 km/hr. Distance downstream= 15 km, Time taken to row downstream = 5 hrs. Speed downstream = 15/5 = 3 km/hr. Man’s rate in still water = (3 + 2) * ½ = 2.5 kmph
If a + b + c = 12 and ab + bc + ca = 50, then find the value of a2 + b2 + c2.
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In â–³ ABC, AB = AC. A circle drawn through B touches AC at D and intersect AB at P. If D is the midpoint of AC and AP = 2.5 cm, then AB is equal to:
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(44² × 16²) ÷ (184.8 ÷ 8.4) =? × 64
If
= 2 then find ![](ht...</a></li> <div class="clearfix mt-3"></div>
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