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Let the speeds of boats ‘A’ and ‘B’ in still water be 8x km/hr and 9x km/hr Therefore, speed of the current = 0.25 × 8x = 2x km/hr According to the question, 8x + 2x = 490/7 Or, 10x = 70 Or, x = 7 Therefore, upstream speed of boat ‘B’ = 9x – 2x = 7x = 49 km/hr Downstream speed of boat ‘B’ = 9x + 2x = 11x = 77 km/hr Required time taken = (98/49) + (770/77) = 2 + 10 = 12 hours
The most popular grape variety in India is
Which one is the infective stage of Rotylenchulus reniformis?
A. Preadult female
B. 2 stage juvenile
C. 3 stage juvenile
Re-sowing is the management option under
23 मई को मनाये जानेवाले विश्व कछुआ दिवस का मुख्य फोकस क्या �...
The method of monitoring the nutritional status of plants by periodic and regular sampling and analysis of soil and plant parts is known as:
...Which among the following is monophagous insect pest?
What will be the error degree of freedom for testing 5 varieties of wheat in Latin Square Design?
The Bhopal tragedy was caused by the gas
Sub soil application of herbicides kill