Explanation

Step 1: Time taken for one lap

First car:

5/50=1/10 hour=6 minutes 

Second car:

5/80=1/16 hour=3.75 minutes 

Step 2: Find when they meet at the starting point together

We need the LCM of 6 minutes and 3.75 minutes.

Convert to seconds:

• 6 minutes = 360 seconds 

• 3.75 minutes = 225 seconds 

LCM (360, 225) = 1800 seconds = 30 minutes

So, both cars will return to the starting point together after 30 minutes.

Step 3: Add to starting time

9:00 a.m. + 30 minutes = 9:30 a.m.

*

Explanation

Speed = 360 ÷ 4 = 90 km/h

New speed = 90 + 20 = 110 km/h

Time = 360 ÷ 110 = 3.27 hours (approx.).

Verified & Updated

Explanation

Speed = Distance ÷ Time

160 ÷ 3 = 53.33 km/h.

Last verified on 09-07-2026

Explanation

Speed = Distance / Time = 600 m / 30 s = 20 m/s

Convert to km/h: 20 × 3.6 = 72 km/h

Last verified on 23-08-2026

Explanation

• Measured length = 250 m
• Standard chain length = 20 m
• Chain is 10 cm longer = 0.10 m
• Actual chain length = 20 + 0.10 = 20.10 m

Formula:

True Length=Measured Length×Actual Chain Length/Standard Chain Length​

Substitute:

=250×20.10/20

​ $$=250\times 1.005$$

=251.25 m

Last updated by NS on 14-8-2026
​

Explanation

Rate = 1350 dishes per 1 hour = 60 minutes

In 16 minutes:

Dishes = 1350 × (16 / 60)

= 1350 × 0.2666...

= 360

Last verified on 06-08-2026

Explanation

Speed = 200 km/hr

Time from 12:24 PM to 2:12 PM:

From 12:24 to 1:24 = 1 hour

From 1:24 to 2:12 = 48 minutes

Total time = 1 hour 48 minutes = 1 + 48/60 = 1.8 hours

Distance = Speed × Time

Distance = 200 × 1.8

Distance = 360 km

Last verified on 05-08-2026

Explanation

The hour hand and minute hand coincide once every 65 and 5/11 minutes.

In 12 hours they coincide 11 times. 

They do not coincide at 12:00 at both the start and end, because that would count the same time twice.

Last verified on 03-08-2026

Explanation

22 km = 22,000 m

Circumference of wheel:

22000/500​=44 m

Using $C=\pi d$:

44=22​/7×d
$$d=14\text{m}$$

$$Last\; updated\; 27-07-2026\; by\; NA$$

Explanation

Given:

• Distance = 300 km
• Speed of first train = 60 km/h
• Speed of second train = 90 km/h

Since they are moving toward each other, their relative speed is:

$$60+90=150\text{km/h}$$

Time:

300​/150=2 hours

Last updated 25-07-2026 by NA