The speed of the boat in still water is 10 km/h and the speed of the stream is 6 km/h. A boat goes 48 km downstream with its usual speed but at the time of returning the speed of the boat in still water is tripled. Find the total time taken by boat to cover the whole distance.

Which two signs should be interchanged to make the following equation correct?

7 × 6 ÷ 3 – 6 = 40 + 20

Given below an equation having four blanks you have to check from the alternatives which among the given is correct?

16 _ 22 _ 11 _ 8 _ 40

Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.

23 * 2 * 2 * 5 * 18

Select the correct combination of mathematical signs that can sequentially replace the ‘*’ signs and balance the given equation.

12_6_3_8_3

If '$ means +', '# means –, '@ means ×' and '* means ÷', then what is the value of '16 $ 4 @ 5 # 72 * 8' ?

If 34 – 28 means 952, 544 + 8 means 68, 20 ÷ 5 means 25, 20 x 10 means 10, then 375 – 11 x 270 ÷ 550 + 11 x 35 = ?

If '+' means ' - ', ' X ' means '+', ' - ' means '÷' and '÷' means ' X ', then what is the value of the following expression?

Which among the given operators should replace the “%” (in the same order) in the given expression below:

9 % 14 % 9 % 90 % 42 % 15