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If Rati travels at his usual speed for ‘x’ hours, he covers the same distance as he covered when he travels at a speed 30 km/hr less than usual, but for (x + 3) hours. Which of the following can be determined? (A) If he travels at 20 km/hr less speed than usual, he can cover a distance of 240 km in (x - 1) hours. What is the value of ‘x’? (B) If travels at his usual speed for (t + 2) hours, and at 50% of his usual speed for (t - 2) hours, his average speed for the journey is 68 km/hr. What is his usual speed? (C) His usual speed (in km/hr) is a multiple of 5 between 40 and 50 (both inclusive). If ‘x’ is a whole number, what is his usual speed? (D) If he travels at his usual speed for ‘t’ hours, he covers a distance of 400 km. What is the value of ‘x’?
Arjun covers a certain distance from his home to college at a usual speed of 24 km/hr and takes a certain time. When he increases usual speed by 6 km/hr, he takes 30 minutes less than usual. If he reduces his usual speed by 4 km/hr, he takes 30 minutes more than usual. Find the distance from his home to college. 
Mr A started half an hour later than usual for the marketplace. But by increasing his speed to $$\frac{3}{2}$$ times his usual speed he reached 10 minutes earlier than usual. What is his usual time for this journey?
Which are the corrections applied to the hydrometer readings? (i) Meniscus correction (ii) Temperature correction (iii) Density correction (iv) Dispersing agent correction 
In crystallographic notations, the vector $$\overrightarrow {{\bf{OP}}} $$  in the cubic cell shown in the figure is
Solid State Physics mcq question image
For the compound,
Basics of Organic Reaction Mechanism mcq question image
the stereochemical notations are
Apply correction for tension, if the pull applied during measurement is 15N and standard pull is about 8N. Measured length is about 10m, cross-section of the tape is 5 sq. cm with E 2*107 N/sq. cm.
By walking at 3/4 of his usual speed, a man reaches his office 20 minutes later than usual. His usual time is :
When A travels at a speed of 8 kmph he reaches 4 hours later than usual at his destination spot. And when he travels with a speed of 14 kmph he reaches 2 hours earlier than usual at his destination spot. What is the time taken when he travels at the usual speed?
By walking at 5/6 of usual speed Tejswi reaches her office 15 minutes late than her usual time. What is the usual time taken by her to reach office?