Let the distance be ‘D’ km According to the question, Downstream speed x + y = d/20 or d = 20 (x+y) .......... (i) Upstream speed x-y = d/30 or d = 30(x-y) ........... (ii) Comparing (i) & (ii) 20(x+y) = 30(x-y) 2(x+y) = 3(x-y) 2x + 2y = 3x - 3y x = 5y Hence, y = Speed of the current = 12 km/hour. Speed of boat, x = 5 × 12 = 60 km/hr
A invest twice the sum invested by B and withdraws half of sum after 3 months and again withdraws half of the remaining sum after 7 months. Find ratio o...
Ashu and Sunil together start a business with investment of Rs. 1800 and Rs. ‘x + 1000’, respectively. If the profit earned after 5 years is Rs. 640...
Palash invest thrice the sum invested by Vicky and withdraws half of the sum after 2 months and again withdraws half of the remaining sum after 3 months...
The contributions made by A and B are in the ratio of 2:3. If 20% of total profit is donated and A gets 5890 as his share of profit, what is the total p...
‘A’ and ‘B’ invested Rs. 5000 and Rs. 4200, respectively in a business, together. After 6 months, ‘A’ withdrew 35% of his initial investment...
‘C’ and ‘D’ entered into a business by investing Rs. ‘y’ and Rs. ‘y + 300’, respectively. After 10 months ‘C’ invested Rs. 400 more ...
X, Y, and Z join a partnership and invest some amount. After one year, X doubles its investment, Y increases its investment by 33(1/3)%, and Z increases...
Palash invest thrice the sum invested by Vicky and withdraws half of the sum after 3 months and again withdraws half of the remaining sum after 5 months...
A and B entered into a business investing their capital in the ratio of 16:21, respectively and the respective ratio of time for which they made their i...
M and N invested Rs. 6400 and Rs. 5000, respectively, when they first started their businesses. After a year, N increased his investment by 40% while M ...
