Question
The speed of current is 10 km/h. What will be the
respective downstream speed and upstream speed of a boy rowing a boat, if one sixth of the distance covered going downstream in a certain time is equal to the distance covered going upstream in the same time?Solution
Let the speed of boy in still water be X km/h. And the speed of current = 10 km/h Downstream speed = (X + 10) km/h Upstream speed = (X – 10) km/h Let time be ‘t’ hours. ⇒ [(X + 10) t]/6 = (X – 10) t ⇒ X + 10 = 6X – 60 ⇒ X = 14 km/h Downstream speed = 14 + 10 = 24 km/h Upstream speed = 14 – 10 = 4 km/h
Which two signs should be interchanged to make the given equation correct?
396 ÷ 2 × 4 – 217 + 74 = 935
Which letter-cluster will replace the question mark (?) in the following series?
QFU, TLD, ?, ZXV, CDE
If all the vowels in the word ‘USEFUL’ are changed to the next letter in the English alphabetical order and all the consonants remain the same then ...
Gurman drove 28 km towards the West, took a left turn and drove 22 km. She then took a right turn and drove 18 km. She again took a right turn and drove...
Statement:
Some Maths are Physics
Few Physics are not Chemistry
Only English is Chemistry
Conclusion:
I. Some C...
Select the number from among the given options that can replace the question mark(?) in the following series.
523, 498, 475, 454, 435, ?
Seven persons A0, B0, C0, D0, E0, F0 and G0 are sitting around a circular table facing the center (not necessarily in the same order). Two persons sit b...
In a certain code language, STRAIGHT is written as TSARGITH. How will THURSDAY be written as in that language?
Select the related alternative from the given:
Spring: Summer :: _______.
Relevant for Exams:
