A) 40 kmph
B) 45 kmph
C) 50 kmph
D) 30 kmph
Correct Answer: D
Solution :
Suppose Required speed = x kmph Then \[\frac{60}{60}+\frac{40}{x}=\frac{100}{45}\] \[1+\frac{40}{x}=\frac{20}{9}\] \[\frac{40}{x}=\frac{11}{9}\] \[x=\frac{40\times 9}{11}\] \[=\frac{360}{11}\,km/hr\] \[=\]\[32.72\,\,kmph\]You need to login to perform this action.
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